The best under-sink water filter systems depend on what you want to remove, how much space you have, and whether you need reverse osmosis or simpler filtration. I rank the Waterdrop 15UA as the best overall for its high stated capacity and straightforward under-sink format, while the iSpring RCC7AK-BN stands out for multi-stage reverse osmosis and the CuZn UC-200 for a long filter-life interval. These options differ in filtration method, maintenance, installation needs, and the kinds of water concerns they address. A high-capacity carbon filter is not interchangeable with reverse osmosis, and neither is a substitute for checking what is in your water. Read on for the full comparison, selection criteria, and advice on choosing a system that fits your sink cabinet and water goals.
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Key Takeaways
- Waterdrop 15UA leads the roundup for buyers who want a high-capacity, direct-connect style system without moving to reverse osmosis.
- Reverse osmosis is a different category of choice: the iSpring RCC7AK-BN and amazon.com/dp/B083NR5DVY?tag=wholehousewaterlab-20&ascsubtag=dc-1282869″ target=”_blank” rel=”nofollow sponsored noopener”>Waterdrop G3P600 offer more involved multi-stage filtration, with added installation and upkeep considerations.
- Long stated capacity does not tell the whole story: the CuZn UC-200, Waterdrop UA-5Y, and several 22,000-gallon options still need evaluation by certified claims, water use, and replacement guidance.
- A dedicated faucet changes the installation equation: the Waterdrop 10UB and reverse-osmosis systems may suit kitchens where a separate drinking-water outlet is preferred, while direct-connect models can keep the existing faucet.
- Waterdrop has the broadest range in this lineup, from compact basic filtration to ultrafiltration and reverse osmosis, so buyers should choose by treatment need rather than brand or stage count alone.
| Waterdrop 15UA Under-Sink Water Filter System, 19,000-Gallon Capacity |  | Best Overall for Long Service Life | Capacity: 19,000 gallons | Filter life: Up to 24 months | Maximum flow rate: 0.75 gpm at 60 psi | VIEW LATEST PRICE | See Our Full Breakdown |
| Amazon Basics Under-Sink Water Filter System, 11,000-Gallon Capacity |  | Best for Straightforward Chlorine and Taste Reduction | Capacity: 11,000 gallons | Service life: Up to 12 months | Purification method: Activated carbon | VIEW LATEST PRICE | See Our Full Breakdown |
| Waterdrop TSA 8-Layer Under-Sink Water Filter System |  | Best for Higher Flow and Multi-Filter Filtration | Filtration stages: 8 | Number of filters: 3 | Maximum flow rate: 1.5 GPM | VIEW LATEST PRICE | See Our Full Breakdown |
| Waterdrop 10UA Under-Sink Water Filter System, NSF/ANSI 42 Certified |  | Best Compact Pick | Capacity: 11,000 gallons | Filter life: Up to 12 months | Tested flow rate: 0.75 GPM at 60 PSI | VIEW LATEST PRICE | See Our Full Breakdown |
| CuZn UC-200 Under-Sink Water Filter, NSF/ANSI 42 & 372, 5-Year Filter Life |  | Best for Long-Term Inline Installation | Model: UC-200 | Filtration stages: 3 | Filter life: 5 years | VIEW LATEST PRICE | See Our Full Breakdown |
| ICEPURE WFS6310A Under-Sink Water Filter System |  | Best for Fast, Low-Fuss Filtration | Filtration method: Activated carbon, 8 stages | Filter precision: 0.5 μm | Filter capacity: Up to 12,000 gallons | VIEW LATEST PRICE | See Our Full Breakdown |
| Waterdrop UA-5Y 5-Year Under Sink Water Filter System |  | Best for Fewer Filter Changes | Filtration method: 0.5 μm activated carbon block | Filter life: Rated for 5 years | Maximum flow rate: 1.33 GPM | VIEW LATEST PRICE | See Our Full Breakdown |
| ICEPURE Under-Sink Water Filter System, 22,000-Gallon Capacity |  | Best for High Flow and High Capacity | Filtration method: Coconut-shell activated carbon | Filter capacity: Up to 22,000 gallons | Recommended filter life: Up to 3 years | VIEW LATEST PRICE | See Our Full Breakdown |
| Waterdrop 10UB Under Sink Water Filter System with Dedicated Faucet |  | Best for a Dedicated Drinking-Water Faucet | Filtration method: Activated carbon and other filter media | Capacity: 11,000 gallons listed; product details also state 18,750 gallons | Filter life: 12 months | VIEW LATEST PRICE | See Our Full Breakdown |
| iSpring RCC7AK-BN 6-Stage Alkaline Reverse Osmosis Water Filtration System |  | Best for Reverse Osmosis and Remineralization | Filtration stages: 6 | Purification methods: Reverse osmosis, alkaline, activated carbon, and carbon block | Certification: NSF/ANSI 58 | VIEW LATEST PRICE | See Our Full Breakdown |
| Waterdrop G3P600 Tankless Reverse Osmosis Water Filter System with Silver Faucet |  | Best Tankless Reverse Osmosis Pick | Filtration: 8-stage reverse osmosis | Certifications: NSF/ANSI 42, 58, and 372 | Daily capacity: Up to 600 gallons | VIEW LATEST PRICE | See Our Full Breakdown |
| Waterdrop UL12A Under-Sink Water Filter with Filter Life Reminder |  | Best No-Drill Pick | Purification method: Activated carbon | Certifications: NSF/ANSI 42 and 372 | Maximum capacity: 11,000 gallons | VIEW LATEST PRICE | See Our Full Breakdown |
| Waterdrop TSU 3-Stage Ultra Filtration Under-Sink Water Filter System |  | Best High-Flow Ultrafiltration Pick | Filtration stages: 3 | Purification method: Ultrafiltration, activated carbon, and carbon block | UF membrane: 0.01 micron | VIEW LATEST PRICE | See Our Full Breakdown |
| PUREPLUS Under-Sink Water Filter System, 22,000 Gallons |  | Best High-Capacity Carbon Filter | Model: WFS5300A | Filtration method: Activated carbon, 6-in-1 composite filter | Capacity: 22,000 gallons | VIEW LATEST PRICE | See Our Full Breakdown |
| Waterdrop WD-TSA-UF 0.01 μm Under-Sink Ultrafiltration Water Filter System |  | Best DIY Ultrafiltration Pick | Filtration accuracy: 0.01 μm | Filtration stages: Product information states both 8-stage and 9-stage | Filters included: 3 | VIEW LATEST PRICE | See Our Full Breakdown |
| under sink water filter system | Maximum flow rate | Dimensions | Filter life | Certifications |
|---|---|---|---|---|
| Waterdrop 15UA Under-Sink Wate | 0.75 gpm at 60 psi | 3.9 × 3.6 × 16.7 in | Up to 24 months | — |
| Amazon Basics Under-Sink Water | — | — | — | NSF/ANSI 42 and NSF/ANSI 372 |
| Waterdrop TSA 8-Layer Under-Si | 1.5 GPM | — | — | — |
| Waterdrop 10UA Under-Sink Wate | 2.5 GPM | 3.9 × 3.6 × 12.3 in | Up to 12 months | NSF/ANSI 42 and 372 |
| CuZn UC-200 Under-Sink Water F | — | 5.5 × 14 × 5.5 in (D × W × H) | 5 years | NSF/ANSI 42 and 372 |
| ICEPURE WFS6310A Under-Sink Wa | 1.75 GPM | 6.89 × 3.74 × 14.17 inches | Up to 12 months | NSF/ANSI 42; NSF/ANSI/CAN 372 approved materials and components |
| Waterdrop UA-5Y 5-Year Under S | 1.33 GPM | 3.9 × 3.6 × 16.7 inches | Rated for 5 years | — |
| ICEPURE Under-Sink Water Filte | 2.5 GPM at 60 PSI | 6.81 × 5.39 × 15.55 inches | — | NSF/ANSI 42 and 372 |
| Waterdrop 10UB Under Sink Wate | — | 3.9 × 3.6 × 12.3 inches | 12 months | — |
| iSpring RCC7AK-BN 6-Stage Alka | — | — | — | — |
| Waterdrop G3P600 Tankless Reve | — | 18.12 × 5.67 × 17.72 in | — | NSF/ANSI 42, 58, and 372 |
| Waterdrop UL12A Under-Sink Wat | 0.75 gpm | 3.9 × 3.6 × 12.3 in | Up to 12 months | NSF/ANSI 42 and 372 |
| Waterdrop TSU 3-Stage Ultra Fi | 1.05 GPM | 14.81 × 4.68 × 13.97 in | — | — |
| PUREPLUS Under-Sink Water Filt | 2.5 gpm at 60 PSI | — | 5 years | NSF/ANSI 42 and 372; IAPMO certified |
| Waterdrop WD-TSA-UF 0.01 μm Un | 1.5 gpm | — | — | — |
More Details on Our Top Picks
Waterdrop 15UA Under-Sink Water Filter System, 19,000-Gallon Capacity
I’d put the Waterdrop 15UA first for municipal-water households that want broad contaminant reduction without frequent cartridge changes. Its 19,000-gallon capacity and stated filter life of up to 24 months give it a longer service interval than the Amazon Basics 11,000-gallon system, while its compact inline approach avoids the extra filters and upkeep of the Waterdrop TSA 8-Layer. The listed reductions include chlorine, lead, and PFAS/PFOA/PFOS; the system also retains minerals rather than reducing TDS. Its NSF/ANSI 42 and 372 certification is paired with third-party testing against NSF/ANSI 53 for lead reduction, a useful distinction when comparing certification claims. The tradeoffs are its cold municipal-water limitation and a relatively tall 16.7-inch housing, so I’d check cabinet clearance and water source before choosing it.
Pros:- 19,000-gallon capacity and up to 24 months of stated filter life
- Listed to reduce chlorine, lead, PFAS, PFOA/PFOS, and other contaminants
- Push-to-connect fittings support straightforward installation and replacement
- Retains essential minerals rather than reducing TDS
Cons:- Designed for cold municipal water and not suitable for well water
- 16.7-inch height may not fit every under-sink cabinet
- Uses coconut-shell activated carbon, which may not suit people with a coconut allergy
Best for: Households on cold municipal water that want listed lead and PFAS reductions with fewer filter changes.
Not ideal for: Well-water users, anyone needing TDS reduction, or buyers with limited vertical clearance under the sink.
- Capacity:19,000 gallons
- Filter life:Up to 24 months
- Maximum flow rate:0.75 gpm at 60 psi
- Dimensions:3.9 × 3.6 × 16.7 in
- Installation:Under sink; push-to-connect fittings
- Water source:Cold municipal water only
- Certifications and testing:IAPMO certified to NSF/ANSI 42 and 372; third-party tested against NSF/ANSI 53 for lead reduction
- Replacement filter:WD-RF15
Our verdict“Choose the 15UA if you want a long-life municipal-water filter with listed lead and PFAS reduction and have room for its taller housing.”
Amazon Basics Under-Sink Water Filter System, 11,000-Gallon Capacity
The Amazon Basics Under-Sink Water Filter is the simpler choice for buyers whose main goal is improving municipal water’s chlorine taste and odor, rather than targeting a longer list of contaminants. Its 11,000-gallon capacity and up-to-12-month service life are in the same general range as the Waterdrop 10UA, but the twist-and-lock cartridge is a practical fit for someone who wants uncomplicated replacement. NSF/ANSI 42 and 372 certifications provide defined claims around aesthetic effects and lead content in materials; the product data does not list lead reduction, so I wouldn’t treat it as equivalent to the Waterdrop 15UA’s lead-reduction testing. It supports 3/8-inch lines and includes an adapter for 1/2-inch connections. The main compromise is narrower filtration scope, plus the same cold municipal-water limitation common to these inline systems.
Pros:- Targets chlorine, taste, and odor in municipal water
- Up to 11,000-gallon capacity and 12-month service life
- Twist-and-lock cartridge and push-to-connect fittings simplify maintenance
- Includes an adapter for 1/2-inch connections alongside its 3/8-inch line connection
Cons:- Product data does not list reduction of lead, PFAS, or other specific contaminants beyond chlorine, taste, and odor
- For cold municipal water only
- Up to 12 months of service is shorter than the Waterdrop 15UA’s stated filter life
Best for: Renters or homeowners on municipal water who want a basic under-sink option for chlorine taste and odor with an easy cartridge swap.
Not ideal for: Buyers seeking documented lead or PFAS reduction, well-water treatment, or a system that reduces TDS.
- Capacity:11,000 gallons
- Service life:Up to 12 months
- Purification method:Activated carbon
- Certifications:NSF/ANSI 42 and NSF/ANSI 372
- Connection:3/8-inch line; adapter included for 1/2-inch connections
- Supported TDS level:Up to 500 ppm
- Material:Polypropylene and activated carbon block
- Model number:AMZN8116UA
Our verdict“Pick this system for a straightforward chlorine-and-taste upgrade, but choose the Waterdrop 15UA if lead or PFAS reduction is a priority.”
Waterdrop TSA 8-Layer Under-Sink Water Filter System
The Waterdrop TSA 8-Layer takes a more elaborate route than the single-cartridge Waterdrop 10UA: three filters combine for eight filtration stages and a stated maximum flow rate of 1.5 GPM. That higher listed flow may suit households that fill pitchers or cook with filtered water often, while the stated reductions include chlorine, fluoride, and PFAS and the system retains beneficial minerals. Filter life varies by cartridge—from six months to 12–18 months—so maintenance is less uniform than the Waterdrop 15UA’s single long-life cartridge. It connects to common 3/8-inch or 1/2-inch cold-water lines, but the faucet is not included. This is still a municipal-water filter, not a TDS-reduction system; buyers who need dissolved-solids reduction should look at a reverse-osmosis option elsewhere in the roundup.
Pros:- Three filters provide eight stated filtration stages
- Maximum flow rate is listed at 1.5 GPM
- Designed to reduce chlorine, fluoride, and PFAS while retaining beneficial minerals
- Connects to standard 3/8-inch and 1/2-inch cold-water lines
Cons:- Does not reduce TDS
- Filter replacement intervals vary from six months to 12–18 months
- Faucet is not included and the system is not suitable for hot or untreated well water
Best for: Municipal-water households that value a higher stated flow rate and want multiple filter stages for listed chlorine, fluoride, and PFAS reduction.
Not ideal for: Buyers who want one long-life cartridge, need TDS reduction, rely on untreated well water, or expect a faucet in the box.
- Filtration stages:8
- Number of filters:3
- Maximum flow rate:1.5 GPM
- Compatible connections:3/8-inch and 1/2-inch cold-water lines
- Filter lifespans:6 months; 8–12 months; 12–18 months
- Water source:Municipal tap water; pre-filtration required for well water
- TDS reduction:Does not reduce TDS
- Certification:NSF/ANSI 42 certified; CT filter passed IAPMO certification
Our verdict“Choose the TSA 8-Layer for a higher-flow, multi-filter setup on municipal water, provided you accept staggered cartridge maintenance and no TDS reduction.”
Waterdrop 10UA Under-Sink Water Filter System, NSF/ANSI 42 Certified
The Waterdrop 10UA is the better fit when cabinet space matters more than extended cartridge life. At 12.3 inches tall, it is shorter than the Waterdrop 15UA, while still offering 11,000 gallons of capacity and a stated service life of up to 12 months. Its twist-and-lock design makes cartridge changes simpler than the three-filter Waterdrop TSA 8-Layer, though the TSA has a higher listed maximum flow rate and a broader staged setup. The 10UA is designed for cold municipal water, retains dissolved minerals, and is listed to reduce chlorine, PFAS, and PFOA/PFOS. Its certifications are NSF/ANSI 42 and 372; buyers should distinguish those from specific contaminant-reduction claims. Check faucet-thread compatibility and cabinet fittings before ordering, since the provided data flags compatibility as something to verify.
Pros:- Shorter 12.3-inch housing than the Waterdrop 15UA
- Up to 11,000-gallon capacity and 12-month filter life
- Twist-and-lock design supports easier filter replacement
- Designed to reduce chlorine, PFAS, and PFOA/PFOS while retaining dissolved minerals
Cons:- Cold municipal water only; not suitable for well water or hot water
- Faucet-thread compatibility may require checking
- Uses coconut-shell activated carbon, which may not suit people with a coconut allergy
Best for: People with modest under-sink clearance who want an inline municipal-water filter with a simple twist-and-lock replacement.
Not ideal for: Households seeking a service interval beyond one year, well-water users, or buyers who need TDS reduction or hot-water filtration.
- Capacity:11,000 gallons
- Filter life:Up to 12 months
- Tested flow rate:0.75 GPM at 60 PSI
- Maximum flow rate:2.5 GPM
- Dimensions:3.9 × 3.6 × 12.3 in
- Filtration method:Activated carbon
- Water source:Municipal cold water only
- Certifications:NSF/ANSI 42 and 372
Our verdict“Choose the 10UA when a shorter housing and easy cartridge swaps matter more than the 15UA’s longer stated service life.”
CuZn UC-200 Under-Sink Water Filter, NSF/ANSI 42 & 372, 5-Year Filter Life
The CuZn UC-200 is the standout here for buyers who want to install an inline filter and leave its cartridge in place for a longer stated interval. Its five-year filter life is far beyond the Waterdrop 10UA’s up-to-12-month schedule, and its three media types—micro-sediment membranes, KDF-55, and coconut-shell carbon—are listed for reducing chlorine, lead, and PFAS/PFOA/PFOS while retaining beneficial minerals. It connects directly to a faucet and requires no drilling, which can suit kitchens where adding a dedicated faucet is undesirable. The tradeoff is a wider 14-inch footprint and no TDS reduction, so it is not a substitute for reverse osmosis when dissolved solids are the concern. Its NSF/ANSI 42 and 372 certifications should not be read as certification of every contaminant-reduction claim.
Pros:- Stated five-year filter life reduces the frequency of cartridge replacement
- Three-stage media include micro-sediment membranes, KDF-55, and coconut-shell carbon
- Listed to reduce PFAS, PFOA/PFOS, lead, and chlorine
- Direct inline faucet connection requires no drilling and includes a stainless steel connection hose
Cons:- Does not reduce TDS
- 14-inch width may be awkward in crowded under-sink cabinets
- Product information directs users to customer support for assistance with issues
Best for: Homeowners who want a no-drill inline connection and prefer a multi-year stated filter interval over frequent cartridge changes.
Not ideal for: People who need TDS reduction, have little horizontal cabinet space, or prefer a system with clearly specified self-service support.
- Model:UC-200
- Filtration stages:3
- Filter life:5 years
- Filter media:Micro-sediment membranes, KDF-55, coconut-shell carbon
- Listed reductions:PFAS, PFOA/PFOS, lead, chlorine
- Certifications:NSF/ANSI 42 and 372
- Installation:Inline faucet connection; no drilling required
- Dimensions:5.5 × 14 × 5.5 in (D × W × H)
Our verdict“Pick the UC-200 for a no-drill inline setup and a long stated filter interval, but skip it if you need TDS reduction or have tight cabinet space.”
ICEPURE WFS6310A Under-Sink Water Filter System
The WFS6310A is a strong fit for municipal-water kitchens where a brisk flow and simple upkeep matter more than advanced purification. Its 1.75 GPM flow rate is higher than the Waterdrop 10UB’s listed 0.75 GPM system flow, so filling a pot should feel less like a bottleneck. The 12,000-gallon capacity also reduces replacement frequency compared with many annual-change filters, while the twist-lock cartridge and tool-free push-to-connect fittings aim to keep routine service straightforward.
Its activated-carbon system targets chlorine, odors, heavy metals, rust, and sediment while retaining minerals. The tradeoff is scope: it is for cold municipal water only, and the listed certifications cover chlorine reduction and component materials rather than broad contaminant removal. Choose it for convenient everyday filtration, not as a substitute for reverse osmosis or a well-water treatment system.
Pros:- Listed 1.75 GPM flow supports quicker filling than the Waterdrop 10UB’s listed system flow.
- 12,000-gallon capacity can mean fewer cartridge changes than annual-life systems.
- Tool-free push-to-connect installation and twist-lock cartridge replacement simplify upkeep.
- Designed to reduce chlorine, odors, heavy metals, rust, and sediment while retaining minerals.
Cons:- Limited to cold municipal tap water, not well water.
- NSF/ANSI 42 and 372 claims do not establish broad reduction of every listed contaminant.
- Connection compatibility and under-sink clearance still need checking before installation.
Best for: Households on municipal cold water that want a fast-flowing filter with infrequent cartridge changes and tool-free servicing.
Not ideal for: Well-water users, anyone needing hot-water filtration, or buyers seeking reverse-osmosis-style TDS reduction.
- Filtration method:Activated carbon, 8 stages
- Filter precision:0.5 μm
- Filter capacity:Up to 12,000 gallons
- Filter life:Up to 12 months
- Maximum flow rate:1.75 GPM
- Water source:Cold municipal water only
- Operating pressure:30–125 psi
- Dimensions:6.89 × 3.74 × 14.17 inches
- Certifications:NSF/ANSI 42; NSF/ANSI/CAN 372 approved materials and components
Our verdict“Choose the WFS6310A if you want quick-flow municipal-water filtration and low-fuss replacement, but skip it for well water or TDS reduction.”
Waterdrop UA-5Y 5-Year Under Sink Water Filter System
The UA-5Y’s defining advantage is its five-year filter rating, which suits buyers who would rather avoid the recurring cartridge schedule of the ICEPURE WFS6310A or Waterdrop 10UB. Its 0.5 μm activated-carbon block is described as reducing chlorine, PFOA/PFOS, particles, turbidity, rust, and sand while retaining minerals. It runs without electricity and connects to a kitchen faucet, keeping the setup relatively uncomplicated for a municipal-water application.
That long service interval comes with practical limits. The 1.33 GPM maximum flow is below the ICEPURE WFS5300A’s listed 2.5 GPM, and the 16.7-inch body may be awkward in crowded cabinets. It is also not recommended for well water, and its NSF/ANSI 372 certification concerns materials rather than independently confirming every reduction claim. This is a maintenance-first choice, not a high-flow or all-source solution.
Pros:- Five-year rated filter life reduces routine replacement frequency.
- Operates without electricity and is designed for quiet use.
- Retains essential minerals while targeting chlorine, PFOA/PFOS, particles, turbidity, rust, and sand.
- Rated for a higher supported TDS level than some comparable municipal-water filters, up to 700 ppm.
Cons:- Not recommended for well water.
- At 16.7 inches tall, it may not fit comfortably in compact sink cabinets.
- Its 1.33 GPM maximum flow is lower than the ICEPURE WFS5300A’s listed 2.5 GPM.
Best for: Municipal-water households with adequate cabinet height that want to reduce how often they replace an under-sink filter.
Not ideal for: Well-water users, homes with tight vertical clearance, or households prioritizing the fastest dispensing flow.
- Filtration method:0.5 μm activated carbon block
- Filter life:Rated for 5 years
- Maximum flow rate:1.33 GPM
- Reductions listed:Chlorine, PFOA/PFOS, turbidity, rust, sand, particles, taste, and odor
- Water source:Municipal tap water; not recommended for well water
- Maximum supported TDS:700 ppm
- Temperature range:35–100 °F
- Dimensions:3.9 × 3.6 × 16.7 inches
- Certification:NSF/ANSI 372
Our verdict“Pick the UA-5Y if minimizing filter changes matters more than cabinet space or maximum flow and your source is municipal water.”
ICEPURE Under-Sink Water Filter System, 22,000-Gallon Capacity
For buyers who want a straightforward carbon filter without slowing down the kitchen faucet, this ICEPURE model combines a 2.5 GPM tested flow rate with a listed 22,000-gallon capacity. That gives it a clear performance edge over the Waterdrop 10UB’s listed 0.75 GPM system flow, while its quick-change cartridge is intended to make replacement a tool-free task. Coconut-shell activated carbon targets chlorine, taste, and odor, with the design retaining beneficial minerals.
The compromise is a narrower filtration brief than the ICEPURE WFS6310A, which lists reductions for heavy metals, rust, and sediment as well. The WFS5300A is cold-water only and needs compatible 3/8-inch or 1/2-inch female NPT connections, so buyers should check plumbing before ordering. Its capacity is rated up to three years, but actual replacement timing can depend on water use and conditions.
Pros:- Listed 2.5 GPM flow rate is the highest among these five products.
- 22,000-gallon capacity and up-to-three-year recommended life can reduce replacement frequency.
- Quick-change cartridge is designed for tool-free replacement.
- NSF/ANSI 42 and 372 certifications are listed.
Cons:- For cold water lines only.
- Requires compatible 3/8-inch or 1/2-inch female NPT connections.
- Its listed reduction scope is narrower than the ICEPURE WFS6310A’s contaminant list.
Best for: Municipal-water households that fill large pots often and want high flow with a long-rated cartridge life.
Not ideal for: Buyers seeking broad contaminant claims beyond chlorine, taste, and odor, or those with incompatible plumbing connections.
- Filtration method:Coconut-shell activated carbon
- Filter capacity:Up to 22,000 gallons
- Recommended filter life:Up to 3 years
- Maximum flow rate:2.5 GPM at 60 PSI
- Outer filter layer:0.5 micron
- Compatible connections:1/2-inch or 3/8-inch female NPT
- Water line:Cold water only
- Dimensions:6.81 × 5.39 × 15.55 inches
- Certifications:NSF/ANSI 42 and 372
Our verdict“Choose this ICEPURE if fast dispensing and a long-rated cartridge life lead your priorities, provided your cold-water connection matches.”
Waterdrop 10UB Under Sink Water Filter System with Dedicated Faucet
The 10UB is the pick here for kitchens where a separate drinking-water tap is part of the plan. Its brushed stainless steel faucet avoids using the main faucet for filtered water, and the push-to-connect fittings and twist-and-lock cartridge are meant to keep installation and changes manageable. Compared with the ICEPURE WFS5300A, it has a lower listed system flow but adds a dedicated faucet and a broader set of stated reduction targets, including PFOA/PFOS, heavy metals, and sediment.
Its 11,000-gallon capacity and 12-month filter life call for more frequent maintenance than the Waterdrop UA-5Y’s five-year rating. Product details also give conflicting capacity figures—11,000 and 18,750 gallons—so I would plan around the lower figure unless the manufacturer clarifies it. The system is for cold municipal water, and the natural coconut-shell carbon may not suit people with coconut allergies.
Pros:- Includes a brushed stainless steel dedicated faucet.
- Targets chlorine, taste, odor, PFOA/PFOS, heavy metals, and sediment.
- Push-to-connect fittings and twist-and-lock filter support easier routine servicing.
- IAPMO certified to NSF/ANSI 42 and NSF/ANSI 372.
Cons:- Cold municipal water only; not intended for well water or hot water.
- Listed system flow of 0.75 GPM is slower than the ICEPURE WFS5300A’s 2.5 GPM.
- Capacity information conflicts between 11,000 and 18,750 gallons.
Best for: Homeowners who want a separate filtered-water faucet and a compact system for cold municipal tap water.
Not ideal for: Well-water households, buyers who want to avoid adding a faucet, or anyone with a coconut allergy.
- Filtration method:Activated carbon and other filter media
- Capacity:11,000 gallons listed; product details also state 18,750 gallons
- Filter life:12 months
- Maximum system flow rate:0.75 GPM
- Maximum supported TDS:700 ppm
- Water source:Cold municipal tap water
- Temperature range:35–100 °F
- Dimensions:3.9 × 3.6 × 12.3 inches
- Certification:IAPMO certified to NSF/ANSI 42 and NSF/ANSI 372
Our verdict“Choose the 10UB if a dedicated filtered-water faucet matters more than high flow or a long interval between replacements.”
iSpring RCC7AK-BN 6-Stage Alkaline Reverse Osmosis Water Filtration System
The RCC7AK-BN takes a different route from the carbon-only ICEPURE and Waterdrop systems: reverse osmosis reduces TDS, then an alkaline stage adds minerals back. That makes it the more suitable choice of these five for buyers who want a broader purification approach rather than mainly targeting chlorine, taste, and odor. The NSF/ANSI 58 certification, included brushed-nickel faucet, and top-mounted faucet design add useful detail for a full under-sink RO setup.
The extra treatment comes with a bigger installation footprint. Unlike the compact Waterdrop 10UB, this system includes a storage tank, and its 15.5 × 16 × 18-inch system dimensions call for more cabinet room. It also needs regular filter changes, with a six-month cycle listed, and its stated operating pressure is 70 psi. Choose it for RO and remineralization; skip it if a compact, low-maintenance carbon filter is the priority.
Pros:- NSF/ANSI 58-certified full system.
- Reverse osmosis reduces TDS, while the alkaline stage adds minerals back.
- Includes a storage tank and brushed-nickel faucet.
- Top-mounted faucet design and quick-fit connections can ease installation.
Cons:- Storage tank and system take substantially more under-sink space than the Waterdrop 10UB.
- The first-stage filter is listed for a six-month replacement cycle.
- The stated operating pressure is 70 psi, which buyers should check against their plumbing conditions.
Best for: Households that want reverse-osmosis treatment with TDS reduction and remineralization, and have room for a tank under the sink.
Not ideal for: Small-cabinet kitchens or buyers seeking a simple, compact carbon filter with fewer components and less scheduled maintenance.
- Filtration stages:6
- Purification methods:Reverse osmosis, alkaline, activated carbon, and carbon block
- Certification:NSF/ANSI 58
- Maximum production rate:75 gallons per day
- Power:No power needed
- Operating pressure:70 psi
- Supported maximum water TDS:750 ppm
- First-stage filter life:6 months
- Included components:RO system, brushed nickel faucet, storage tank, and extra tool set
Our verdict“Pick the RCC7AK-BN if you want RO-based TDS reduction and remineralization and can accommodate its tank and filter schedule.”
Waterdrop G3P600 Tankless Reverse Osmosis Water Filter System with Silver Faucet
For buyers who want reverse osmosis without a storage tank, the G3P600 stands apart from the lineup’s carbon and ultrafiltration systems: it reduces TDS as well as listed contaminants such as chlorine, fluoride, and PFAS. Its 600-gallon-per-day capacity and 0.42 gpm flow rate suit steady household use, while the smart faucet displays TDS and filter life so you can check system status at the sink. The 2:1 pure-to-drain ratio also limits wastewater compared with less efficient RO setups. Compared with the Waterdrop TSU 3-Stage, this is the better fit when TDS reduction is a priority, but it adds electrical dependence and more installation constraints. The tankless layout saves cabinet space, though its dimensions still need checking before purchase, and filter changes still require ongoing replacement planning.
Pros:- Reverse osmosis reduces TDS as well as several listed contaminants.
- Tankless design avoids the space needed for a storage tank.
- Smart faucet displays TDS and filter-life information.
- Filter replacements are designed to require no tools.
Cons:- Requires an electrical connection under the sink.
- Cabinet dimensions and installation clearance need checking.
- RO filtration produces drain water despite its 2:1 pure-to-drain ratio.
Best for: Households seeking under-sink reverse osmosis and TDS reduction, with an available power outlet and room to verify the system’s dimensions.
Not ideal for: Renters or kitchens without accessible under-sink electricity, and buyers who want a simple non-RO filter with fewer installation requirements.
- Filtration:8-stage reverse osmosis
- Certifications:NSF/ANSI 42, 58, and 372
- Daily capacity:Up to 600 gallons
- Pure-to-drain ratio:2:1
- Flow rate:0.42 gpm
- Dimensions:18.12 × 5.67 × 17.72 in
- Power:Corded electric; under-sink outlet required
- Faucet features:TDS monitor and filter-life tracker
Our verdict“Choose the G3P600 if you want tankless reverse osmosis and TDS monitoring and can accommodate its power and installation needs.”
Waterdrop UL12A Under-Sink Water Filter with Filter Life Reminder
The UL12A is aimed at buyers who want an under-sink filter without drilling for a separate faucet. Its freestanding, suction-cup design connects to a cold-water line and uses activated carbon to reduce listed substances including chlorine, lead, and PFAS while retaining dissolved minerals. A built-in audible and visual reminder makes filter changes harder to overlook, and the stated 11,000-gallon capacity with up to 12 months of filter life means fewer routine changes than the Waterdrop TSU 3-Stage, whose filters have staggered intervals. The tradeoff is that the UL12A does not reduce TDS, so it is not an alternative to the G3P600 for buyers seeking reverse osmosis. Its 0.75 gpm flow is also more modest than the TSU’s maximum, and the coconut-shell carbon may not suit people with a coconut allergy.
Pros:- No-drill installation with a freestanding suction-cup base.
- Reduces several listed contaminants while retaining dissolved minerals.
- Audible and visual filter replacement reminders.
- Stated capacity of 11,000 gallons and filter life of up to 12 months.
Cons:- Does not reduce TDS.
- Designed for cold-water sources only.
- Coconut-shell activated carbon may not suit people with a coconut allergy.
Best for: Renters and DIY installers who want a compact cold-water filter without drilling a countertop or adding a dedicated faucet.
Not ideal for: Buyers seeking TDS reduction, hot-water filtration, or a system made without coconut-shell activated carbon.
- Purification method:Activated carbon
- Certifications:NSF/ANSI 42 and 372
- Maximum capacity:11,000 gallons
- Filter life:Up to 12 months
- Maximum flow rate:0.75 gpm
- Dimensions:3.9 × 3.6 × 12.3 in
- Installation:Under sink; no drilling required
- Connections:3/8-inch line; 3/8-to-1/2-inch converter included
Our verdict“Pick the UL12A for a no-drill, mineral-retaining filter with reminders, but skip it if TDS reduction is your main goal.”
Waterdrop TSU 3-Stage Ultra Filtration Under-Sink Water Filter System
The TSU is a strong fit for buyers who want fast, mineral-retaining filtration without electricity or wastewater. Its three-stage setup combines ultrafiltration with activated carbon and carbon block, and the 1.05 gpm maximum flow rate is higher than the UL12A’s 0.75 gpm. A separate brushed-nickel faucet and filter-life reminder panel give it a more complete setup than the no-drill UL12A, but the faucet requires countertop drilling. Its UF membrane is listed for up to 24 months, while the other filters have shorter replacement intervals, so maintenance is staggered rather than handled all at once. Unlike the Waterdrop G3P600, the TSU does not reduce TDS; it is also limited to municipal cold water and should not be chosen for well water. That makes it a practical middle ground, not a substitute for RO.
Pros:- Up to 1.05 gpm flow for quick water access.
- Operates without power and produces no wastewater.
- Retains essential minerals while reducing listed contaminants.
- UF filter life is listed at up to 24 months, with a reminder panel.
Cons:- Does not reduce TDS.
- Included faucet requires countertop drilling.
- Not suitable for well water or hot water.
Best for: Households on municipal cold water that want a high-flow, no-power filter, retain dissolved minerals, and can install a dedicated faucet.
Not ideal for: Well-water users, buyers who need TDS reduction, or anyone unable to drill the counter for the included faucet.
- Filtration stages:3
- Purification method:Ultrafiltration, activated carbon, and carbon block
- UF membrane:0.01 micron
- Maximum flow rate:1.05 GPM
- Capacity:2,200 gallons
- Filter lifespans:UF: 24 months; CT: 12 months; PP: 6 months
- Dimensions:14.81 × 4.68 × 13.97 in
- Installation:Under sink; countertop drilling required for included faucet
- Water compatibility:Municipal cold water; does not reduce TDS
Our verdict“Choose the TSU for high-flow municipal-water filtration without power or wastewater if you accept faucet drilling and no TDS reduction.”
PUREPLUS Under-Sink Water Filter System, 22,000 Gallons
PUREPLUS suits buyers who want a high-flow carbon filter with infrequent replacement, rather than reverse osmosis or a multi-filter setup. Its stated 22,000-gallon capacity and five-year filter life are longer than the UL12A’s stated capacity and annual interval, while the 2.5 gpm maximum flow rate is the highest among these five products. The 0.5-micron filtration and activated-carbon composite are described as reducing chlorine and odors and helping remove heavy metals, sediment, and larger particles while retaining minerals. Unlike the Waterdrop G3P600, it does not reduce TDS, and it offers no smart faucet or filter-life reminder. Compatibility is another practical hurdle: it connects to cold water and requires suitable 1/2-inch or 3/8-inch female NPT faucet threads. Check the connection before buying; the flow and capacity matter only if it fits your plumbing.
Pros:- Stated 22,000-gallon capacity and five-year filter life.
- Maximum flow rate of 2.5 gpm.
- Reduces chlorine and odors and helps remove heavy metals and sediment.
- Retains beneficial minerals and does not change TDS.
Cons:- Does not reduce TDS.
- Cold-water supply only.
- Faucet thread compatibility needs checking before purchase.
Best for: Households prioritizing high faucet flow and long stated filter life for cold-water chlorine, odor, and particle reduction.
Not ideal for: Buyers who need TDS reduction, hot-water filtration, filter-life alerts, or a system compatible with different faucet threads.
- Model:WFS5300A
- Filtration method:Activated carbon, 6-in-1 composite filter
- Capacity:22,000 gallons
- Filter life:5 years
- Maximum flow rate:2.5 gpm at 60 PSI
- Filtration accuracy:0.5 microns
- Certifications:NSF/ANSI 42 and 372; IAPMO certified
- Compatible faucet threads:1/2-inch or 3/8-inch female NPT
- Installation:Under sink; cold water only
Our verdict“Pick PUREPLUS for high flow and long stated filter life if its cold-water connection fits and you do not need TDS reduction.”
Waterdrop WD-TSA-UF 0.01 μm Under-Sink Ultrafiltration Water Filter System
The WD-TSA-UF is for DIY buyers who want compact ultrafiltration with quick-connect fittings and staged filter replacement. Its 0.01-micron membrane and three included filters are described as helping reduce chlorine, taste and odor, fluoride, heavy metals, rust, sediment, and particles while retaining dissolved minerals. At a listed maximum of 1.5 gpm, it offers more flow than the TSU 3-Stage, though the products differ in installation: this model uses twist-and-lock and push-to-connect fittings, while the TSU includes a separate faucet that requires countertop drilling. Its filter intervals vary by cartridge, reaching up to 12 months for the UF filter, so maintenance still needs tracking. The product information gives both eight- and nine-stage descriptions, which makes the stage count unclear. Like the TSU, it does not reduce TDS and is intended for municipal cold water.
Pros:- 0.01-micron ultrafiltration membrane helps reduce a range of listed contaminants.
- Twist-and-lock and push-to-connect fittings support DIY installation.
- Staggered filter intervals let users replace cartridges on different schedules.
- Maximum flow rate is listed at 1.5 gpm.
Cons:- Does not reduce TDS.
- Designed for municipal cold water; well water may require pre-filtration.
- Product information gives conflicting eight- and nine-stage descriptions.
Best for: DIY installers on municipal cold water who want ultrafiltration, mineral retention, and push-to-connect fittings without relying on TDS reduction.
Not ideal for: Buyers seeking reverse osmosis or TDS reduction, those using hot or untreated well water, and anyone needing an unambiguous filtration-stage specification.
- Filtration accuracy:0.01 μm
- Filtration stages:Product information states both 8-stage and 9-stage
- Filters included:3
- Purification method:Ultrafiltration
- Maximum flow rate:1.5 gpm
- Filter lifespans:10PP: up to 6 months; 10GC: 8–12 months; 10UF: up to 12 months
- Temperature range:35–100 °F
- Faucet connections:1/2-inch or 3/8-inch female NPT
- Water compatibility:Municipal cold water; does not reduce TDS
Our verdict“Choose the WD-TSA-UF for DIY municipal-water ultrafiltration and higher listed flow, but not for TDS reduction or well-water use.”
How We Picked
I compared these 15 under-sink systems by filtration approach, clearly stated capacity and service life, installation format, maintenance demands, and the kinds of buyers each design may suit. I also distinguished standard filtration from ultrafiltration and reverse osmosis: those approaches have different strengths and should not be treated as equivalent just because each fits beneath a sink. Where product names state certifications or a particular micron rating, I considered those as useful selection details, while recognizing that buyers should verify the exact certified claims for the contaminants they care about.
The ranking favors useful balance and clear fit over the largest capacity number or most treatment stages. The Waterdrop 15UA ranks first as a broadly practical option; the iSpring RCC7AK-BN and Waterdrop G3P600 serve buyers seeking reverse osmosis, but their added complexity makes them less suitable as universal picks. Long-life and high-capacity models earn attention for reducing filter-change frequency, while faucet-based, reminder-equipped, and ultrafiltration systems rank by the specific installation or maintenance problem they solve. Every pick has tradeoffs, including limits in treatment scope, space, upkeep, or the need to confirm fit with existing plumbing.
| under sink water filter system | Certifications |
|---|---|
| Waterdrop 15UA Under-Sink Wate | — |
| Amazon Basics Under-Sink Water | NSF/ANSI 42 and NSF/ANSI 372 |
| Waterdrop TSA 8-Layer Under-Si | — |
| Waterdrop 10UA Under-Sink Wate | NSF/ANSI 42 and 372 |
| CuZn UC-200 Under-Sink Water F | NSF/ANSI 42 and 372 |
| ICEPURE WFS6310A Under-Sink Wa | NSF/ANSI 42; NSF/ANSI/CAN 372 approved materials and components |
| Waterdrop UA-5Y 5-Year Under S | — |
| ICEPURE Under-Sink Water Filte | NSF/ANSI 42 and 372 |
| Waterdrop 10UB Under Sink Wate | — |
| iSpring RCC7AK-BN 6-Stage Alka | — |
| Waterdrop G3P600 Tankless Reve | NSF/ANSI 42, 58, and 372 |
| Waterdrop UL12A Under-Sink Wat | NSF/ANSI 42 and 372 |
| Waterdrop TSU 3-Stage Ultra Fi | — |
| PUREPLUS Under-Sink Water Filt | NSF/ANSI 42 and 372; IAPMO certified |
| Waterdrop WD-TSA-UF 0.01 μm Un | — |
Factors to Consider When Choosing Under Sink Water Filter Systems
Before choosing a system, match the treatment method to a water concern you can identify, then check that the hardware fits your plumbing and routine. These buying factors can help prevent common mismatches that product capacity or a long feature list alone will not resolve.
Start With Your Water Report, Not the Filter’s Stage Count
Get a current water quality report from your utility, or use a suitable lab test if you rely on a private well. Then compare the contaminants listed there with the system’s specific performance claims and certifications. A system described as multi-stage is not automatically effective for every contaminant, and a broad-sounding label does not establish a treatment claim. Carbon-based systems, ultrafiltration, and reverse osmosis serve different purposes, so choose by the concern rather than by the number of layers. A common mistake is buying for taste alone when the real concern requires a verified contaminant reduction claim. If the documentation does not identify the contaminant and test basis, treat that gap as a reason to ask the manufacturer before buying.
Choose Between Direct-Connect, Dedicated-Faucet, and RO Plumbing
Under-sink systems do not all connect to the kitchen in the same way. Some feed filtered water through the existing faucet, while others include a separate faucet; reverse-osmosis installations can add tubing, a drain connection, and sometimes a storage or tankless arrangement. Check the sink’s spare holes, cabinet layout, shutoff access, and drain configuration before selecting a model. Renters or households avoiding countertop and sink changes may prefer a simpler connection, but they should still confirm that the supplied fittings work with their plumbing. A dedicated faucet can make filtered water easy to identify, yet it may require drilling or an unused faucet opening. Plan the installation around your actual sink, not a generic cabinet diagram.
Treat Capacity as a Maintenance Estimate, Not a Guarantee
Published gallon capacity helps compare replacement intervals, but actual filter life can change with water quality, household consumption, and the manufacturer’s replacement instructions. A high-capacity cartridge may mean fewer changes for a family that uses a lot of water, while a low-use household may reach a time-based replacement point first. Check whether the product specifies both a gallon limit and a calendar interval, and whether all stages are replaced together. Skipping replacements can reduce performance even when the system still produces water. Before purchase, look up replacement-filter availability and confirm the exact cartridge model. Long stated life is useful only if the replacement parts remain easy to source and the schedule is practical for your home.
Decide Whether Reverse Osmosis Fits Your Water Use
Reverse osmosis can be a strong choice for buyers seeking a broader treatment approach, but it brings more components and maintenance than a basic carbon filter. Depending on the design, installation may involve a drain line and a separate faucet, and the system may produce reject water as part of filtration. Tankless models avoid a storage tank but still need room for the unit and its connections. Compare the manufacturer’s contaminant claims, filter schedule, water-use details, and installation instructions before choosing RO. Do not select it simply because it has more stages; a simpler certified filter may better match a taste or chlorine concern. Choose RO when its documented treatment scope justifies the extra setup and upkeep for your household.
Measure Cabinet Space and Check Service Access
Measure the area under the sink with the doors closed and account for the disposal, cleaning supplies, plumbing, and any water softener lines. A filter that technically fits can still be awkward if cartridges cannot be reached for replacement. Note where the cold-water shutoff and drain are located, then compare those positions with the installation diagram. Systems with multiple housings or RO components need more planning than a compact direct-connect unit. Keep some room for hands and a container when changing filters, since cramped access can turn a simple task into a recurring nuisance. If you cannot confirm clearance from the product dimensions and installation guide, contact the manufacturer before ordering.
Compare Ownership Costs and Support, Not Just the First Cartridge
Budget for replacement filters, any dedicated faucet or fittings, and possible installation help rather than focusing only on the system itself. Check whether replacement cartridges are sold as a complete set or in separate stages, since that affects both upkeep and the chance of missing a needed change. Look for clear instructions, warranty terms, and support for troubleshooting leaks or low flow. A filter reminder can help busy households, but it does not replace the manufacturer’s schedule or a check of actual water use. Buyers who want minimal maintenance may value a longer service interval, while those with uncertain water quality may prefer a system with clearly documented stage-by-stage replacement guidance. The best ownership fit is the one you can maintain correctly over time.
Frequently Asked Questions
Can a standard under-sink filter remove the same contaminants as reverse osmosis?
No; the treatment methods and documented reduction claims differ, so the label “under-sink filter” does not tell you what a system can remove. Compare the specific contaminant claims and certifications for each model against your water report. The Waterdrop 15UA and similar direct-connect options are not interchangeable with the iSpring RCC7AK-BN or Waterdrop G3P600 simply because all are installed below the sink. Reverse osmosis can be suitable when its documented treatment scope matches your needs, but it adds installation and maintenance considerations. If your concern is health-related, use a test or utility report and confirm the exact claim with the manufacturer before relying on a system.
Should I choose the largest gallon-capacity filter in this roundup?
Not automatically. Capacity is one part of the replacement schedule, and it does not show whether a system addresses the contaminants you care about or fits your plumbing. The 22,000-gallon models may appeal to households seeking fewer cartridge changes, but compare their certification details, replacement instructions, and expected household usage. A lower-capacity option may be the better fit if its treatment claims match your water and its cartridge is easier to source. Also check whether the stated capacity applies to the full system or a particular filter element. Treat capacity as a maintenance clue, not a stand-alone measure of filtration quality.
Do I need a separate faucet for an under-sink water filter?
No. Some systems connect to an existing faucet, while models such as the Waterdrop 10UB and many reverse-osmosis setups use a dedicated faucet. A separate outlet can make filtered water easy to identify, but it may require an available sink hole or drilling and adds another fixture to install. Direct-connect designs can preserve the sink’s appearance and avoid a new faucet, though you should verify compatibility with your existing plumbing. Check the product’s installation instructions before purchase, especially if you rent or have a crowded sink cabinet. The right setup depends on your sink openings, installation permission, and preference for a separate drinking-water tap.
How do I know whether an under-sink system will fit my kitchen?
Measure the usable cabinet space and compare it with the system’s dimensions and installation diagram, leaving room to reach cartridges and shutoff valves. Include the garbage disposal, drain pipes, stored supplies, and any existing water lines in your measurements. For a dedicated-faucet model, check for an unused sink opening or confirm whether drilling is allowed. Reverse-osmosis systems can need additional room for tubing and drain connections, even when a tankless design saves space. If the instructions do not show the connection layout clearly, ask the manufacturer or an installer before buying. A system that fits on paper but blocks routine filter changes is a poor long-term match.
Is a long-life filter a good choice if my household uses little water?
It can reduce the frequency of cartridge changes, but the advertised gallon figure may not be the only replacement limit. Some products also specify a calendar interval, and water quality can affect service life. Review the instructions for both time and volume requirements rather than assuming low usage means the filter can stay in place indefinitely. A model such as the CuZn UC-200 or Waterdrop UA-5Y may appeal to buyers seeking longer intervals, but compare the exact replacement guidance and cartridge availability. Keep a record of installation and changes so the system is maintained on schedule. If you are unsure how the stated life applies to your water, ask the manufacturer for guidance.
Conclusion
For most households seeking a practical starting point, I recommend the Waterdrop 15UA as best overall because its high stated capacity and direct under-sink format offer a useful balance without the added complexity of RO. For buyers who prioritize fewer filter changes, compare the CuZn UC-200 as a long-life option and the high-capacity ICEPURE or PUREPLUS models against their specific certification claims and replacement schedules before choosing. The iSpring RCC7AK-BN is my premium pick for households whose water concerns justify a multi-stage reverse-osmosis setup, while the Amazon Basics system is a straightforward value-oriented option for shoppers who want a simpler format and can verify that its claims fit their needs. Beginners should start with a direct-connect model such as the 10UA and confirm installation compatibility before ordering. For a dedicated faucet, consider the Waterdrop 10UB; for a filter-life reminder, the UL12A; and for ultrafiltration, compare the TSU and WD-TSA-UF by their documented treatment claims. Choose the system that matches your water, plumbing, and maintenance habits—not simply the longest capacity figure or most elaborate stage count.
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