Best Whole House Carbon Filter (2026 Expert Recommendation)

People ask me which whole house carbon filter is the best one to buy. For most homes, on city water or on a well, it's our Clack 2.5 non-backwashing carbon tank with Centaur catalytic carbon. It takes out chlorine and chloramine at every tap, needs no drain and no electricity, and fits a house of 2 people up to 10.

It isn't the right pick for every house. Below is which carbon tank fits which water, what each one costs today, the size of house each one fits, and when a well needs something other than carbon first.

The carbon tank I recommend most

The carbon tank I recommend most is our Clack 2.5 non-backwashing carbon filter, $1,695. It's a 2.5 cubic foot Vortech tank holding 2 cubic feet of Centaur catalytic carbon, under a Clack head that runs on water pressure alone: no drain, no electricity, nothing to program. As I say in the video, the 2.5 is "one size that fits all, and it can handle 2 people in the house, up to 10 people in the house."

For city water, and for a well where the iron filter and softener already did the heavy work, I steer people to the non-backwashing tank. There's no sediment for a backwash to rinse out, so a backwashing valve would only add a drain line, an outlet and cost.

When the carbon is used up, the old carbon is dumped out and new carbon goes in; the tank and the valve stay. For the 2.5 that's two 1 cubic foot bags of Centaur refill carbon, $590 in all.

What two buyers wrote

Both are verified purchases, quoted as the buyers wrote them.

If your water has sediment, iron, or heavy particulate, the Fleck 2510SXT Backwashing Carbon Filter is the better choice. The backwash cycle flushes trapped sediment out of the tank so the carbon media stays clean. That's a well question, and only when the carbon is the only filter; see when you need a backwashing tank.

Which carbon tank fits your water

Find the row that matches your water. Every tank on this list holds the same Centaur catalytic carbon (the Big Blue kit is a cartridge with standard carbon), so the choice comes down to your water and the size of your house.

Not sure which tank fits your water?

Text me what you're seeing

Send me your lab report, or tell me what you taste or smell and whether you're on city water or a well. I'll tell you which tank fits, or that you don't need one.

Text Aidan443-277-2204 Call800-460-5810Aidan

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What a whole house carbon filter fixes

A carbon tank takes out chlorine and chloramine, and the taste and smell that come with them, at every tap and in the shower. It also reduces many man-made chemicals: some chlorine byproducts, many solvents (VOCs), some pesticides and herbicides, and PFAS. On a well, it handles a light rotten egg smell.

It does not remove hardness, iron, manganese, bacteria, nitrate or fluoride. Hard water needs a water softener, iron needs an iron filter, bacteria needs a UV light, and nitrate and fluoride need reverse osmosis at the kitchen sink (see carbon filter vs reverse osmosis). The full list, chemical by chemical, is in my guide to what a carbon filter removes.

Catalytic vs standard activated carbon

Every carbon tank we sell holds Centaur catalytic carbon, which handles chloramine. Centaur is made by Calgon Carbon. Standard granular activated carbon is good for basic chlorine, taste and odor. Chloramine (chlorine with ammonia added) breaks down more slowly in carbon, and catalytic carbon is treated to break chemicals like chloramine and hydrogen sulfide down instead of only holding them.

Whether your city uses chlorine or chloramine, it doesn't change which tank you buy from us. For more, see catalytic carbon vs standard activated carbon and what activated carbon is.

When you need a backwashing tank

A backwashing carbon tank is for a well with heavy sediment or some iron and no other filter. In the video I put it this way: "you may need a backwashing filter, like if you have heavy sediment or some iron in the water," and you want the carbon filter by itself.

The Fleck valve rinses the sediment out to a drain, so it needs a floor drain, standpipe or utility sink, 1/2 inch drain tubing your plumber supplies, and a 120V outlet. Your well also has to keep up with the rinse: about 6 to 7 gallons a minute for the 1.5 and about 10 for the 2.5. It adds about $400 to $500 over the non-backwashing tank of the same size.

Backwashing does not make the carbon last longer. As I tell callers, "Carbon is an absorbent. Once it absorbs it, it doesn't come back out." On city water, "backwashing is not gonna do anything," and I don't send a rotten egg smell to a backwashing tank either. The whole comparison is in backwashing vs non-backwashing carbon filter.

What size carbon filter do you need

Size a carbon tank by how many people live in the house. The 2.5 fits most homes, 2 to 10 people, and the 1.5 fits smaller homes. I offer the 1.5 to households of 2 to 4. When someone could go either way, I tell them the bigger tank "has better flow rates" and its carbon lasts longer.

Where a carbon filter goes in your system

On a well, the carbon tank goes after the iron filter and the softener. It polishes water the other equipment has already treated. Not every home needs every step; your water test decides which ones you need.

1. Pressure tank. Every filter comes after it.
2. Sediment filter. A 20 inch Big Blue 5 micron filter ($195) catches sand and grit first.
3. Iron filter or acid neutralizer, if your test calls for one.
4. Water softener, if the water is hard.
5. Carbon tank.
6. UV light, last in line, if you have one.

On city water the setup is shorter: most homes need the carbon tank, plus a water softener if the water is hard. City water typically has little sediment, so a sediment filter isn't really necessary. Each step on a well, and why it goes where it does, is in my guide to the correct order for well water treatment systems, and whether a well needs a carbon tank at all is in carbon filter for well water.

On a well, test before you buy anything. Our well water test kit ($199) reads 53 contaminants and values, including the iron and hardness that decide what goes ahead of the carbon. It does not test for the rotten egg gas; your nose tells you that one.

Can a cartridge do the whole house?

A cartridge on the wall holds a small amount of carbon, so for a whole house I recommend a tank. People ask me, "Can I just get a filter from Home Depot that mounts on the wall with a carbon cartridge in it to take care of my odor problem or taste problem or the chlorine?" My answer in the video: "No, you can't. That's not really designed for whole house use."

The one cartridge setup I'll point you to is our 20 inch Big Blue carbon kit, $259: a Pentair Pentek Big Blue housing with a standard granular carbon cartridge, rated for about 25,000 gallons. It takes the chlorine taste out of city water with no drain or power. It is not for chloramine, iron, sediment or a sulfur smell. The money over 10 years, tank against cartridge, is in my guide to how long the carbon lasts.

Will a carbon filter remove PFAS?

A carbon tank reduces PFAS, the "forever chemicals"; it does not remove all of them. EPA says activated carbon works well on the longer-chain ones, PFOA and PFOS, and not as well on shorter-chain ones like PFBS and PFBA, and that how well it works depends on the carbon, the depth of the carbon, the flow rate and the specific PFAS. None of the whole house tanks we sell is certified to reduce PFAS.

In the video I say a carbon tank will remove PFAS; the accurate word is reduces. If PFAS is the reason you're buying, test for it, retest after the tank is in, and read my guide to PFAS in drinking water, which covers the PFAS systems built for it.

What ships with your carbon tank

Every carbon tank ships empty, and the carbon comes in separate bags that go into the tank at install. What ships: the Vortech tank, the control valve with a bypass valve, the carbon in its bags and a fill funnel. Plumbing fittings are not included, and neither is drain tubing; the backwashing tanks need 1/2 inch tubing to a drain, which your plumber supplies. The connections are 1 inch male thread, and PVC, PEX, CPVC or copper all work.

We recommend installation by a licensed plumber. For a non-backwashing tank on its own, a plumber usually needs about an hour or two. A carbon tank plus a softener runs about $800 to $1,000 for the plumber. I support your plumber by phone at 800-460-5810.

Frequently asked questions