Do Water Softeners Filter Water?

A softener changes what is dissolved in the water. A filter catches what you do not want in it. Here is how the main options compare:

Activated carbon is "commonly used in filters to trap contaminants and improve taste and odor," according to the EPA, but it "does not remove nitrates, bacteria, or dissolved minerals." Calcium and magnesium are dissolved minerals, so they pass through.

A water softener is the reverse. The EPA describes it as removing "the calcium and magnesium ions found in hard water." It is not designed to take out the disinfectant your utility adds, which matters in DFW (more on that below).

That is why the right question is not "softener or filter?" It is "what is in my water?" Hard water calls for a softener. Chlorine taste, sediment, or iron call for a filter. Many homes have both problems.

A water softener is built to remove hardness, not disinfectant. In Dallas-Fort Worth that distinction matters, because the major utilities here disinfect with chloramine, not plain chlorine:

• Fort Worth adds "monochloramines (chlorine and ammonia)," averaging 3.3 ppm in its 2025 report.
• Dallas says, "We use chloramine instead of chlorine."
• The North Texas Municipal Water District reports a chloramine residual averaging 3.19 ppm in 2025. Each spring, NTMWD switches to free chlorine for about a month, according to Frisco's 2025 water quality report.

The Water Quality Association says chloramines are "difficult to remove by distillation, reverse osmosis, and ion exchange resins." Ion exchange resin is what is inside a water softener. The WQA says "the most effective nonchemical method for removing chloramines is by activated carbon," and that it can take a bed contact time of 10 minutes or more. So a carbon filter for DFW water needs to be sized for chloramine.

If the chlorine taste or smell is what bothers you, see chlorine taste and smell.

No. A standard filter does not soften water. Softening means taking the hardness minerals out, and as a 2014 WateReuse Research Foundation report puts it, "Water is considered softened when the calcium and magnesium are removed." Carbon and sediment filters are not built to do that; the EPA notes carbon does not remove dissolved minerals.

The one filter that does take out calcium is reverse osmosis. The EPA says RO "removes beneficial minerals such as calcium, along with contaminants." But a typical RO system sits under one sink and treats drinking water only. The showers, the water heater, the dishwasher, and every other faucet still get hard water.

So if your problem is scale and soap that will not lather, a filter is the wrong tool. A whole-house softener is the tool that removes hardness from every gallon coming into the house.

A salt-free water conditioner is built to reduce scale, not to remove hardness. The 2014 report, a study by Arizona State University for the WateReuse Research Foundation, says these alternatives "reduce scale formation by altering the dissolved scale in the water," and that "some saltfree alternatives do not remove hardness, whereas ion exchange and CDI do remove hardness."

What that study found when it tested scale on heated water:

• Template-assisted crystallization devices reduced scale formation by more than 88 percent.
• Electromagnetic and electrically induced precipitation devices reduced scale formation by about 50 percent.
• Ion exchange (a salt-based softener) "efficiently reduced scale formation, as expected."

The EPA lists conditioners as an alternative to softening and recommends that buyers look for certification to IAPMO/ANSI Z601, the "Standard for Scale Reduction Devices."

The difference comes down to what you want. A conditioner is built to cut scale while the calcium and magnesium stay in the water. A softener takes them out. TAC installs salt-based softeners for hard water because they remove the hardness itself instead of changing how it behaves.

It can need both. Utility reports show hard water and chloramine disinfection, and those are two different problems with two different fixes.

The Water Quality Association calls 7 to 10.5 gpg hard and anything above 10.5 very hard. A softener handles the hardness. A carbon filter sized for chloramine handles the taste and smell at every tap, or reverse osmosis handles it for drinking water at the kitchen sink.

Which ones your home needs depends on the water at your tap, not the city average.

Test the water at your house. A test shows how hard your water is and what else is in it, so you only pay for the system that fixes your actual problem.

TAC offers a free in-home water test across Dallas-Fort Worth. We check your water for hardness, chlorine, iron, and sediment, then recommend a softener, a filter, or both, before you decide anything.