Searching for a whole-house carbon filter tank around 1.5 cubic feet? The products here span more than ready-to-install tanks: some include an automatic backwash valve, one is loose replacement media, and one pairs carbon filtration with water softening. I rank the Fleck 5600 carbon tank first for its straightforward automatic operation and stated 8–12 GPM flow range, while the digital 5600SXT system is a stronger fit for buyers who want programmable control. If hard water is also a problem, the softener-and-carbon combo covers more needs in one package.
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The main tradeoffs are flow and backwash requirements, installation effort, and whether your water needs carbon alone or also softening. One listing gives a continuous-flow figure of just 2.7 GPM while requiring at least 5.5 GPM for backwash, so matching the unit to household demand and available supply matters. These are all 1.5-cubic-foot products, not 15-cubic-foot tanks; I would not treat them as direct substitutes for a genuine 15-cubic-foot system.
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Key Takeaways
- Product 5 is the clearest carbon-only choice for buyers seeking a stated 8–12 GPM flow range and a Fleck 5600 automatic backwash valve.
- Product 2 adds digital 5600SXT controls and tech support, but its stated 2.7 GPM continuous flow and 5.5 GPM backwash requirement need careful checking.
- Product 4 is the only option here that also softens water, though its 180-pound package and iron and hydrogen-sulfide limits narrow its fit.
- Product 3 is carbon media only, not a complete filter tank; it suits replacement or custom-system projects.
- Every supplied product is listed at 1.5 cubic feet. Buyers who truly require 15 cubic feet should keep searching for a system with that stated media volume.
| Whole House Carbon Filter System with Fleck 5600 Valve (1.5 cu. ft.) |  | Best Overall Carbon-Only Tank | Media capacity: 1.5 cu. ft. | Media type: Coconut-shell activated carbon | Control head: Fleck 5600 automatic | VIEW ON AMAZON | See Our Full Breakdown |
| Carbon Tank System Whole House 1.5 cu ft Fleck 5600 Filter Valve (Black) |  | Best for a Bypass Valve and Clear Warranty Terms | Model: CB1.5-56 | Capacity: 1.5 cu. ft. | Control head: Fleck 5600 automatic backwash | VIEW ON AMAZON | See Our Full Breakdown |
| Digital Carbon 1.5 Cu. Ft. Backwashing System with Fleck 5600SXT Valve (Remove Chlorine, Chloramines, Chemicals, Tastes, and Odors) |  | Best for Digital Controls | Media capacity: 1.5 cu. ft. | Control valve: Fleck 5600SXT digital | Media: Granular activated carbon | VIEW ON AMAZON | See Our Full Breakdown |
| Combo Package Fleck 5600SXT 48,000 Grain Water Softener and Backwashing Carbon Filter |  | Best for Homes That Need Softening Too | Softener capacity: 48,000 grains | Carbon filter volume: 1.5 cu. ft. | Softener resin volume: 1.5 cu. ft., as listed | VIEW ON AMAZON | See Our Full Breakdown |
| LiquaGen 1.5 Cubic Foot Coconut Carbon Media for Whole House Water Systems |  | Best Replacement Media for a Compatible Tank | Volume: 1.5 cu. ft. | Material: Coconut-shell carbon | Type: Activated charcoal media | VIEW ON AMAZON | See Our Full Breakdown |
| whole house carbon filter tank 15 cubic foot | Control head |
|---|---|
| Whole House Carbon Filter Syst | Fleck 5600 automatic |
| Carbon Tank System Whole House | Fleck 5600 automatic backwash |
| Digital Carbon 1.5 Cu. Ft. Bac | — |
| Combo Package Fleck 5600SXT 48 | Fleck 5600SXT metered |
| LiquaGen 1.5 Cubic Foot Coconu | — |
More Details on Our Top Picks
Whole House Carbon Filter System with Fleck 5600 Valve (1.5 cu. ft.)
This is my leading pick for a buyer who wants a complete carbon tank with automatic backwashing and a useful stated flow range. Its listing gives 8–12 GPM, a 1-inch adapter, and a 10-by-54-inch fiberglass tank loaded with coconut-shell carbon. Those specifics make it easier to judge physical fit and potential household demand than a listing that gives media volume alone.
Compared with Product 1, it offers a stated flow range and tank dimensions, while Product 1 calls out a stainless-steel bypass valve and a longer tank warranty. Product 2 adds digital controls, but its stated continuous flow is far lower and its backwash requirement deserves verification. Product 5’s simpler Fleck 5600 setup is a sensible middle ground if a digital schedule is not a priority.
The tradeoff is that the supplied specifications list a five-year valve warranty but do not state a separate tank warranty. Its 10-by-54-inch footprint still needs dedicated space, and installation calls for plumbing know-how. I would also confirm the exact included fittings and flow suitability before ordering; “easy DIY” does not remove the need for properly connected plumbing and adequate backwash supply.
Pros:- Preloaded 1.5-cubic-foot coconut-shell carbon media
- Fleck 5600 automatic control head and backwash cycle
- Stated 8–12 GPM flow range and 1-inch adapter
- Fiberglass tank dimensions are provided for space planning
Cons:- A 10-by-54-inch tank needs substantial installation space
- Plumbing knowledge may be needed for a correct setup
- The supplied specifications list only a valve warranty
Best for: Households seeking a complete 1.5-cubic-foot carbon system with automatic backwashing and a stated 8–12 GPM flow range.
Not ideal for: Buyers who need a genuine 15-cubic-foot tank, a softener, or a system with a clearly listed separate tank warranty.
- Media capacity:1.5 cu. ft.
- Media type:Coconut-shell activated carbon
- Control head:Fleck 5600 automatic
- Flow rate:8–12 GPM
- Tank size:10 × 54 in.
- Tank material:Fiberglass
- Connection:1-inch adapter
- Listed warranty:5 years for valve
Our verdict“I rank this first for carbon-only buyers because it combines an automatic Fleck valve, a stated household flow range, and useful tank dimensions.”
Carbon Tank System Whole House 1.5 cu ft Fleck 5600 Filter Valve (Black)
Product 1 is a strong alternative when the details that matter most are a stainless-steel bypass valve and separate tank and valve warranty terms. It includes a Fleck 5600 automatic backwash head, coconut-shell carbon, and a stated capacity for whole-house filtration up to 12 GPM. The bypass is particularly useful for isolating the unit during service without cutting into plumbing.
Against Product 5, this listing gives a more complete warranty picture: five years for the valve and ten for the tank. Product 5, in turn, specifies its 10-by-54-inch tank and 1-inch adapter, so buyers comparing installation dimensions may prefer that entry. Both use a Fleck 5600, but this system’s stainless-steel bypass is its clearest differentiator.
The product description names a broad set of target contaminants, including chlorine, chloramines, pesticides, herbicides, and organics. That should not be read as a guarantee for every water supply; buyers should compare claims with a water test and confirm the media’s suitability. The system ships in multiple boxes, which adds handling during setup, and the listing cautions that appearance may vary. Its stated 1.5-cubic-foot capacity is also far below a literal 15-cubic-foot requirement.
Pros:- Fleck 5600 automatic backwashing control head
- Stainless-steel bypass valve for system isolation
- Coconut-shell carbon with broad listed contaminant targets
- Separate five-year valve and ten-year tank warranties
Cons:- Ships in multiple boxes that require extra handling
- Color and design may differ from product images
- No tank dimensions are supplied in the provided specifications
Best for: DIY-minded buyers who value a stainless-steel bypass, automatic backwashing, and stated tank and valve warranty periods.
Not ideal for: Anyone seeking a true 15-cubic-foot unit, a digital control head, or a single-box delivery.
- Model:CB1.5-56
- Capacity:1.5 cu. ft.
- Control head:Fleck 5600 automatic backwash
- Bypass valve:Stainless steel
- Tank material:Durable polygalas, per listing
- Media:High-activity coconut-shell carbon
- Valve warranty:5 years
- Tank warranty:10 years
Our verdict“I would choose this over Product 5 when the stainless bypass and explicit tank warranty matter more than published tank dimensions.”
Digital Carbon 1.5 Cu. Ft. Backwashing System with Fleck 5600SXT Valve (Remove Chlorine, Chloramines, Chemicals, Tastes, and Odors)
Product 2 stands apart through its Fleck 5600SXT digital valve and DIY support. Buyers who want a programmable interface rather than the standard Fleck 5600 control head on Products 1 and 5 may find the digital approach a better match. The listing also describes granular activated carbon and targets chlorine, chloramines, pesticides, herbicides, MTBE, THMs, organics, tastes, and odors.
That feature set comes with a specification buyers should resolve before purchase. The listing states a 2.7 GPM continuous flow, yet it also says the system needs at least 5.5 GPM for backwashing to maintain warranty coverage. Those figures describe different operating conditions, but they make this a less straightforward choice than Product 5’s stated 8–12 GPM range. I would ask the seller to confirm what flow suits the home and whether the water supply can meet the backwash minimum.
This option is not recommended for hydrogen sulfide, so it does not address rotten-egg odor according to the supplied details. At 95 pounds, it may also be awkward to move into place. Detailed instructions and tech support are helpful, but they do not offset a mismatch between household flow needs and the stated figures. Compared with Product 4, it filters without adding softening; compared with Product 1, its appeal is digital control rather than the bypass and warranty details.
Pros:- Digital Fleck 5600SXT backwashing valve
- Granular activated carbon targets several stated chemical and odor concerns
- DIY instructions and listed technical support
- Five-year valve and ten-year tank warranties
Cons:- Listed 2.7 GPM continuous flow may not suit higher household demand
- Requires at least 5.5 GPM backwash flow per listing
- Not intended for hydrogen-sulfide removal and weighs 95 pounds
Best for: Buyers who want a digital Fleck control head and can verify both household flow needs and backwash supply.
Not ideal for: Homes with hydrogen-sulfide odor, limited backwash flow, or demand that exceeds the listed continuous-flow figure.
- Media capacity:1.5 cu. ft.
- Control valve:Fleck 5600SXT digital
- Media:Granular activated carbon
- Continuous flow:2.7 GPM, as listed
- Minimum backwash flow:5.5 GPM, per listing
- Weight:95 lb.
- Valve warranty:5 years
- Tank warranty:10 years
Our verdict“I recommend this for digital-control preference only after the buyer confirms that its flow and backwash requirements fit the home.”
Combo Package Fleck 5600SXT 48,000 Grain Water Softener and Backwashing Carbon Filter
Product 4 is the broadest treatment package here, pairing a 48,000-grain water softener with a separate 1.5-cubic-foot backwashing carbon filter. It is not simply a larger carbon tank: the added softener addresses hardness, while the carbon stage is described as reducing tastes, odors, chemicals, and particulates. For a household that needs both functions, the combined package may be more coherent than buying a carbon-only option and adding a softener later.
Compared with Products 1 and 5, this package has a more complex purpose and a greater installation burden. It weighs 180 pounds and measures 10 by 10 by 62 inches, so delivery access and the installation area need careful planning. Its metered softener regeneration is designed to respond to water use, unlike the carbon-only systems’ filtration focus. Product 2 offers a digital carbon valve but does not supply the softening function included here.
The stated water limitations narrow its audience: the package is described as suitable for city or well water that is free of iron, hydrogen sulfide, and bacteria. It is not the right pick for a water problem involving those contaminants, and the listing does not make it a substitute for water testing or a treatment plan for them. I would choose this only when hardness is a real need and the source water matches the stated limits.
Pros:- Combines a 48,000-grain softener with a 1.5-cubic-foot carbon filter
- Metered softener regeneration responds to water use
- Fleck 5600SXT digital control head
- Listed NSF certification
Cons:- 180-pound package may call for professional installation
- Not intended for water with high iron, hydrogen sulfide, or bacteria
- Larger and more involved than the carbon-only alternatives
Best for: Households with hard water that also want a backwashing carbon stage and have room for a heavier combined installation.
Not ideal for: Buyers needing carbon filtration only, homes with iron or hydrogen-sulfide concerns, or installations with limited space or access.
- Softener capacity:48,000 grains
- Carbon filter volume:1.5 cu. ft.
- Softener resin volume:1.5 cu. ft., as listed
- Control head:Fleck 5600SXT metered
- Dimensions:10 × 10 × 62 in.
- Weight:180 lb.
- Warranty:5 years control head; 10 years tank
- Certification:NSF, as listed
Our verdict“This is my pick when hardness treatment is needed alongside carbon filtration, not when the buyer wants the simplest carbon-only tank.”
LiquaGen 1.5 Cubic Foot Coconut Carbon Media for Whole House Water Systems
Unlike the other entries, Product 3 is loose carbon media, not a complete filter system. It offers 1.5 cubic feet of coconut-shell activated charcoal in pellet form, intended for compatible whole-house equipment. That makes it a practical candidate for a media replacement or a custom build when the buyer already has a tank, riser, and suitable backwash valve.
Its role is narrower than Products 1, 2, and 5, which bundle carbon with an automatic control head, or Product 4, which adds softening. The listed media targets chlorine, VOCs, taste, and odor, and the description emphasizes mechanical strength and low ash content. But the buyer must supply or already own the hardware that turns bulk media into a functioning backwashing filter. There is no valve, tank, bypass, or installation kit described here.
This format can be a poor fit for someone expecting a ready-to-connect whole-house tank. The listing also notes that the media may need periodic replacement or thermal reactivation, so ownership includes future media planning. It is still only 1.5 cubic feet; it cannot meet a 15-cubic-foot requirement by itself. Compared with Product 1, this gives more flexibility for an existing compatible system but far less installation convenience.
Pros:- 1.5 cubic feet of coconut-shell activated carbon
- Pellet form is intended for whole-house water systems
- Description lists chlorine, VOC, taste, and odor reduction goals
- Suitable for residential or commercial applications, per listing
Cons:- Media only; compatible tank and valve are not included
- May need replacement or thermal reactivation
- No backwash, flow, tank, or warranty specifications are supplied
Best for: Owners of compatible whole-house filter tanks who need coconut-shell carbon replacement media or are assembling a custom system.
Not ideal for: First-time buyers seeking a complete tank, valve, bypass, and installation-ready package.
- Volume:1.5 cu. ft.
- Material:Coconut-shell carbon
- Type:Activated charcoal media
- Form:Pellets
- Application:Whole-house water purification
- Listed targets:Chlorine, VOCs, taste, and odor
Our verdict“I would buy this only for a compatible existing tank or a planned custom build, not as a complete whole-house filter.”
How We Picked
I ranked these options by how well each serves someone looking for a whole-house carbon tank near 1.5 cubic feet, while keeping the literal 15-cubic-foot phrase in view. Since none of the supplied products is a 15-cubic-foot system, I make that mismatch explicit rather than presenting these as equivalent to a much larger tank. The rankings reflect the supplied descriptions and specifications, not independent performance testing.
My main comparison points are whether the listing includes a complete tank and valve, the control head and backwashing arrangement, stated flow information, media type, and practical installation demands. I also distinguish carbon filtration from water softening: a carbon filter addresses stated taste, odor, chlorine, and organic-contaminant goals, while the combo package adds a separate softening function. I give loose media a different role because it requires compatible equipment.
Where specifications conflict or seem difficult to reconcile, I treat that as a buyer check rather than smoothing it over. For example, the digital system’s listed 2.7 GPM continuous flow sits beside a 5.5 GPM minimum backwash-flow requirement. A buyer should confirm the intended flow figures and their own well or plumbing supply with the seller before choosing. I also weigh stated limitations, such as hydrogen sulfide exclusions, system size, and the need for plumbing work.
| whole house carbon filter tank 15 cubic foot | Control head |
|---|---|
| Whole House Carbon Filter Syst | Fleck 5600 automatic |
| Carbon Tank System Whole House | Fleck 5600 automatic backwash |
| Digital Carbon 1.5 Cu. Ft. Bac | — |
| Combo Package Fleck 5600SXT 48 | Fleck 5600SXT metered |
| LiquaGen 1.5 Cubic Foot Coconu | — |
Factors to Consider When Choosing Whole House Carbon Filter Tank 15 Cubic Foot
I would start by confirming what the phrase “15 cubic foot” means for your project. The five supplied products are all listed at 1.5 cubic feet, a tenfold difference from 15 cubic feet. If that larger media volume is a firm requirement, do not choose one of these as a substitute. If you meant a 1.5-cubic-foot whole-house carbon tank, the checks below help separate the ready-to-install systems from the special-purpose options.
Confirm media volume and system type
Media volume describes the carbon bed, not the tank’s external dimensions or the amount of water treated over its lifetime. Every listed complete carbon system has 1.5 cubic feet of media; Product 3 sells that amount as bulk media without a tank. Product 4 also has 1.5 cubic feet of carbon, but it includes a separate softener. Ask the seller to confirm the exact media volume if your target is a true 15-cubic-foot bed, and compare systems on the same basis.
Match flow and backwash supply
A tank has to serve household demand while also receiving adequate flow for periodic backwashing. Product 5 states an 8–12 GPM range, and Product 1 describes filtration up to 12 GPM. Product 2 lists 2.7 GPM continuous flow and a minimum 5.5 GPM backwash supply. Since those values affect different operating stages, I would ask the seller how each applies to your plumbing and measure the home’s available supply rather than assuming the largest number is the everyday service rate.
Choose a control head that suits your setup
Products 1 and 5 use the Fleck 5600 automatic control head; Product 2 and Product 4 list the digital 5600SXT. A digital valve may appeal to buyers who want programmable settings, while the standard 5600 keeps the choice simpler. Product 1 adds a stainless-steel bypass, which can make service isolation more convenient. Check which fittings, bypass parts, drain connections, and instructions are actually included before treating a listing as a complete installation kit.
Identify what your water needs treated
Carbon systems are presented here for concerns such as chlorine, taste, odor, and some organic chemicals. That does not make every model suitable for every well-water problem. Product 2 specifically excludes hydrogen sulfide, and Product 4 is described for water free of iron, hydrogen sulfide, and bacteria. I would get a water test and match it to the product’s stated limits. If hardness is also an issue, Product 4 adds a softener; a carbon-only tank does not perform that separate function.
Plan space, handling, and ongoing media care
Compare tank dimensions with the installation space, service access, drain location, and route from delivery to the utility area. Product 5 lists a 10-by-54-inch tank; Product 4 is 62 inches high and weighs 180 pounds; Product 2 weighs 95 pounds. Bulk media such as Product 3 requires a compatible vessel and future replacement or reactivation planning. For any backwashing unit, confirm drain arrangements, plumbing connections, and sufficient flow before installation.
Frequently Asked Questions
Is any product here a 15-cubic-foot carbon filter tank?
No. All five supplied entries are listed as 1.5 cubic feet of carbon or media, and Product 4 pairs a 1.5-cubic-foot carbon filter with a softener. A 15-cubic-foot tank is a much larger system. I would not treat these recommendations as meeting that specification; confirm the required media volume with the seller before buying.
Which option is a complete whole-house carbon system?
Products 1, 2, and 5 are described as carbon systems with tanks and Fleck control valves. Product 4 includes a carbon filter as part of a softener-and-filter package. Product 3 is bulk carbon media only, so it needs a compatible tank, valve, and plumbing to operate as a whole-house filter.
How do I choose between a Fleck 5600 and 5600SXT valve?
The supplied listings distinguish the 5600 as the automatic control head on Products 1 and 5, while Products 2 and 4 use the digital 5600SXT. Consider whether the digital controls suit your preferences, but compare more than the valve label: check the system’s flow figures, backwash supply, included bypass parts, and warranty terms. Product 2’s stated continuous-flow and backwash figures should be clarified with the seller.
Can a carbon filter remove hardness or rotten-egg odor?
Carbon filtration and water softening serve different purposes. Product 4 combines a softener with carbon filtration, while the carbon-only systems do not claim to soften water. Product 2 specifically says it is not suitable for hydrogen-sulfide removal, and Product 4 is described for water free of hydrogen sulfide. Use a water test to identify the problem and choose treatment that addresses it.
What should I check before installing a backwashing carbon tank?
Check available service flow, the required backwash flow, drain access, tank clearance, plumbing connections, and delivery access. Confirm the valve settings and included fittings with the seller, especially if the listing gives more than one flow figure. Larger or heavy packages, such as Product 2 at 95 pounds and Product 4 at 180 pounds, may need help moving or installing them.
Conclusion
For a complete carbon-only system near 1.5 cubic feet, I would start with Product 5 because it states an 8–12 GPM range and gives tank dimensions; choose Product 1 instead if its stainless-steel bypass and separate tank warranty matter more. Product 2 is best reserved for buyers who specifically want digital control and can verify its flow requirements. If your home also needs hardness treatment, Product 4 is the purpose-built combo, provided the water matches its stated limits and the installation can handle its size. Product 3 is for replacing media in compatible equipment, not for a first system. Above all, if you truly need a 15-cubic-foot carbon tank, none of these five meets that requirement.
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