Whole-home water filtration, installed at the main line
Carbon filtration where water enters the house, so every tap, shower and appliance gets treated water. The right system for chlorine taste and odor. The wrong system for hardness or nitrate.
What does a whole-home filter do?
A whole-home filter, also called point-of-entry filtration, sits on the main water line where it enters the house. Water passes through a tank of filtration media, usually activated carbon, before reaching any fixture. Every shower, every tap and every appliance in the house receives filtered water.
Carbon works on chlorine and chloramine taste and odor, disinfection byproducts, sediment and a range of volatile organic compounds. It does nothing for hardness, which takes ion exchange, and nothing for nitrate, which takes reverse osmosis. Central Iowa water is drawn largely from rivers and is chlorinated, which is why point-of-entry carbon has a real job to do here. It is also why it is frequently sold as a solution to problems it cannot touch.
Why surface water matters in this market
Central Iowa Water Works members pull substantially from the Raccoon and the Des Moines rivers, not from deep wells. Surface water carries more seasonal variation in organic content than groundwater, and treating it requires disinfection. The practical consequence at your tap is chlorine taste that changes through the year and can be noticeably stronger in some months than others.
That seasonal swing is the most common reason metro homeowners call us about taste and smell. It is also the thing a point-of-entry carbon system handles well, including in the shower, which a kitchen filter cannot do.
Tank systems against cartridge systems
A backwashing tank system holds a bed of loose carbon media and periodically flushes itself, which keeps the bed from channeling and extends media life to several years. A cartridge system uses replaceable filter elements in a housing, costs less to install, and needs attention more often.
For a typical metro house with two or more bathrooms, a backwashing tank is usually the better long-run choice, because cartridge systems at whole-house flow rates either restrict your pressure or need changing often enough that people stop doing it. Sizing follows your peak flow rate, and peak flow comes off your fixture count, not off how many people live there.
Where a whole-home filter is the wrong answer
We would rather say this before you buy than after. If your complaint is scale on fixtures, cloudy glassware or soap that will not lather, the system you need is a softener. If your concern is nitrate, the system you need is reverse osmosis at the kitchen sink. A good number of central Iowa homes end up with a softener and an RO unit and no whole-home carbon filter at all, and that is a perfectly correct outcome.
Matching the system to the complaint
| What you notice | Likely cause | The system that fixes it |
|---|---|---|
| Chlorine or pool smell, taste changes by season | Disinfection, surface water source | Whole-home carbon |
| Scale on faucets, cloudy glasses, poor lather | Hardness, 7 to 9 gpg | Water softener |
| Concern about nitrate in drinking water | Seasonal river nitrate | Reverse osmosis |
| Flat or metallic taste at the tap | Total dissolved solids | Reverse osmosis |
| Dry skin and hair after showering | Hardness, often with chlorine | Softener, sometimes with carbon |
Questions we get asked
Does a whole-home filter soften water?
No. Carbon filtration and ion exchange softening are different processes solving different problems. A whole-home carbon filter addresses chlorine taste and odor, sediment and organic compounds. Hardness requires a softener. Some systems combine both functions in one or two tanks, but the carbon stage by itself does nothing for hardness.
Will a whole-home filter remove nitrate?
No. Carbon does not meaningfully reduce nitrate. Reverse osmosis at the point of use is the household method for nitrate, which matters in central Iowa given the seasonal river levels that have driven two watering bans in two summers.
How often does the media need replacing?
A backwashing carbon tank typically runs several years before the media is replaced, because the periodic backwash keeps the bed from channeling. Cartridge systems need changing far more often. We give you the interval in writing with the quote.
Will it reduce my water pressure?
Not if it got sized to your peak flow rate instead of your household size. Undersized whole-home filtration is the usual culprit behind a pressure complaint, so we size on fixture count and measured flow.
Do I need a whole-home filter if I already have a softener and RO?
Often not. If hardness is handled at the point of entry and drinking water is handled at the sink, a carbon filter mainly adds chlorine reduction for showering and laundry. That is a real benefit for some households and an unnecessary purchase for others, which is what the test is for.
Find out whether you need one
Plenty of central Iowa homes do not. We test first and tell you straight, and the test is free either way.