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Whole House Carbon Water Filters
Whole house carbon water filters that take chlorine, chloramine, taste, odor and chemical contaminants out of every tap: backwashing systems on Clack and Fleck valves, upflow tanks that need no drain or power, cartridge-style Pentair and Crystal Quest units, and the activated and catalytic carbon media to rebed them. Built to order, shipped free, 5-year valve and 10-year tank warranty on backwashing systems. Backwashing or upflow? Standard or catalytic carbon? The guide below answers both.
Choosing a whole house carbon filter
Activated carbon works by adsorption: water passes through a bed of porous carbon granules and chlorine, chloramine, pesticides, solvents, VOCs and the compounds behind bad taste and smell stick to the surface. A whole house unit does this for all the water entering the home, so showers, laundry and every faucet get the benefit, not just the kitchen. It's the right first system for most city-water homes; on wells it's a finishing stage after iron and sulfur treatment, or the last step after a chlorination system.
What carbon does not do: remove hardness (that's a softener), iron, manganese or sulfur (an iron filter), bacteria (UV) or dissolved solids like arsenic, nitrates and fluoride (reverse osmosis). If your problem is scale or staining, carbon alone won't fix it.
Backwashing, upflow or cartridge?
| Type | How it works | Best for | Trade-offs |
|---|---|---|---|
| Backwashing (Clack or Fleck valve) | An automatic valve reverses flow on a schedule to lift and rinse the carbon bed, flushing trapped sediment to drain and resettling the media. | Most homes; any water with sediment; the longest media life (5–10 years); highest flow rates. | Needs a drain line and an outlet. Highest up-front cost. |
| Upflow (no valve) | Water enters at the bottom and rises through the bed, which keeps the carbon loose without a backwash cycle. A simple in/out head, no controls. | Clean city water with little sediment; installs where there's no drain or power (closets, crawlspaces); lowest maintenance. | Media can't be rinsed, so it's shorter-lived on water with any turbidity. Lower peak flow. |
| Cartridge (Pentair, Crystal Quest) | Carbon in a replaceable cartridge or sealed tank, changed on a schedule rather than regenerated. | Smaller homes, apartments, rentals; anyone who wants a fixed replacement interval. | Ongoing cartridge cost; capacity limited by cartridge size. |
Standard or catalytic carbon?
Standard activated carbon (coconut shell or bituminous coal) handles chlorine, taste, odor and organics. Catalytic carbon is activated carbon treated to catalyse chemical reactions on its surface, which lets it break down chloramine (the chlorine-ammonia disinfectant now used by most large US utilities) and trace hydrogen sulfide that standard carbon barely touches. If your utility uses chloramine, or you're polishing well water after a sulfur or chlorination stage, specify catalytic. Both are a media choice on the backwashing systems below, and both are sold as loose media for rebedding.
| Media | Removes | Typical life | Product |
|---|---|---|---|
| Coconut shell activated carbon | Chlorine, taste, odor, VOCs, pesticides | 5–7 years backwashing; 3–5 upflow | Jacobi coconut shell · Calgon coconut shell · Centaur coconut shell |
| Bituminous coal activated carbon | Chlorine and larger organics; higher capacity per cubic foot | 5–7 years | Filtrasorb bituminous |
| Catalytic carbon | Everything above plus chloramine and trace hydrogen sulfide | 5–7 years | Jacobi catalytic · Centaur catalytic |
Sizing a whole house carbon filter
Size by flow, not by square footage. A 1–2 bath home peaks at about 7–10 GPM, 3–4 baths at 12–15 GPM. Carbon needs contact time, so undersizing the tank means chlorine slips through at peak flow even though the filter "works" at a trickle. For backwashing units the tank also sets the backwash flow your supply must deliver: 5 GPM for a 10″ tank, 7 GPM for 12″, 10 GPM for 13″.
| Home | Service flow | Tank / media |
|---|---|---|
| 1–2 bathrooms | 7–10 GPM | 10″ × 54″, 1.5 cu ft |
| 2–3 bathrooms | 10–12 GPM | 12″ × 52″, 2.0 cu ft |
| 3–4 bathrooms | 12–15 GPM | 13″ × 54″, 2.5 cu ft |
| 5+ bathrooms, 1.25″ plumbing | 15–20 GPM | 14″ × 65″, 3.0 cu ft; 1.25″ valve |
Whole house carbon filters: Clack and Fleck side by side
| Configuration | Clack | Fleck |
|---|---|---|
| Backwashing carbon filter | Backwashing Carbon Filter for Whole House (WS1 valve; from $1,099) | Fleck 2510 AiQ Backwashing Carbon Filter (from $1,199) |
| Carbon + softener in one matched pair | Clack WS1 Softener + Carbon Filter (from $2,199) | Fleck Softener + Backwashing Carbon (from $2,299) |
| Upflow, no drain or power | Clack Upflow Carbon Filter (from $749) | |
| Cartridge / sealed tank | Pentair whole house carbon filter (from $1,279) · Pelican PC600 / PC1000 · Crystal Quest SMART whole house | |
| Carbon + UV | Pelican PC600-PUV-7 · PC1000-PUV-14 | |
The softener-and-carbon pairs are the most common install we ship: the carbon tank goes first and strips chlorine before it reaches the softener resin, which extends resin life, and the softener handles hardness. See softener + filter combo systems for the full range.
Frequently asked questions
Does a whole house carbon filter remove chlorine? Yes; chlorine removal is what carbon does best. For chloramine, specify catalytic carbon. If chlorine is your only concern, see also water filters for chlorine, which includes point-of-use options.
Does it remove PFAS? Granular activated carbon reduces PFOA and PFOS substantially and is one of the EPA's recommended methods, but reduction depends on contact time and media age; for certified PFAS removal at the tap, pair it with an under-sink RO. See PFAS filters.
Will it soften water or stop scale? No. Carbon has no effect on hardness. Pair it with a softener or a salt-free conditioner.
Can I use a carbon filter on well water? After iron, manganese and sulfur are treated, yes; carbon is the standard final stage after a chlorination system to remove the residual chlorine. Put it on raw well water with iron and it will foul in months.
How long does the carbon last? Backwashing systems 5–10 years depending on chlorine level and water use; upflow 3–5 years; cartridges 6–12 months. Rebedding a tank costs a few hundred dollars in media; the valve and tank are reused.
Backwashing or upflow? Backwashing if you have a drain and want the longest life and highest flow. Upflow if there's no drain or outlet where the filter has to go, and your water is clean city supply.
Questions on sizing or media: call 800-374-2143 or request a quote. Related: chlorine filters · softener + filter combos · filtration media · all whole house filtration.
