Are Shower Filters Worth It? | Healthy Home Audit

Short answer: A shower filter can be worth it if you dislike the smell or feel of chlorine in your shower and you buy one certified to NSF/ANSI 177, the standard that verifies free chlorine reduction.^{Source [1]} That is a narrow claim. As of Oct. 30, 2026, every product on NSF's public listing for the standard was certified for free chlorine reduction and nothing else.^{Source [2]} A typical shower filter is not built to soften hard water, may not handle chloramine, and research on skin and hair benefits is limited.^{Source [5]}^{Source [6]}

This guide covers what is actually in your shower water, what shower filters do, what the research says about skin and hair, and how to decide.

What is in your shower water

Most city water is disinfected with either chlorine or chloramine, which is chlorine combined with ammonia.^{Source [3]}^{Source [4]} Chloramine lasts longer as water moves through pipes and creates fewer disinfection byproducts.^{Source [4]} The Environmental Protection Agency (EPA) says chloramines have been used since the 1930s and that more than one in five Americans uses water treated with them.^{Source [3]}

Both are considered safe at the levels allowed in tap water. The Centers for Disease Control and Prevention (CDC) says chlorine or chloramine up to 4 milligrams per liter is considered safe in drinking water,^{Source [4]} and EPA says water with chloramines that meets its standards is safe for drinking, cooking and bathing.^{Source [3]}

That means a shower filter is mostly about comfort, smell and preference, not about making unsafe water safe. CDC does note that some people are more sensitive to these chemicals than others.^{Source [4]}

To find out which disinfectant your utility uses, check its annual water quality report.^{Source [4]} Some utilities switch between chlorine and chloramine at different times of the year.^{Source [4]} Our guide to reading your water report shows where to find that information.

What NSF/ANSI 177 covers

There are no federal regulations for residential shower filters, so independent certification is the main way to check a claim.^{Source [1]} NSF/ANSI 177 sets requirements for:

Safe materials and construction
Product design and durability
Verified reduction of free available chlorine in shower water^{Source [1]}

The current version is harmonized with NSF/ANSI/CAN 372, so certified filters also meet lead-content requirements for their materials.^{Source [1]}

What it does not cover matters just as much. The standard's scope is free chlorine.^{Source [1]} NSF's listing for 177 is short: 10 products from four companies on Oct. 30, 2026, each certified for free chlorine reduction.^{Source [2]} Each listing shows a flow rate and a service cycle in gallons, which tells you when to replace the cartridge.^{Source [2]}

Claim you might see	Covered by NSF/ANSI 177?
Reduces chlorine	Yes, free available chlorine^{Source [1]}^{Source [2]}
Reduces chloramine	Not part of the claim listed for certified products^{Source [2]}
Softens water or removes scale	No; certified claims are chlorine only^{Source [2]}
Better skin or hair	No; the standard verifies chlorine reduction, not health or cosmetic results^{Source [1]}

The chloramine problem

Chloramine is harder to get rid of than chlorine. CDC notes that chlorine dissipates if water sits out for a few days, but chloramine does not.^{Source [4]}

If your utility uses chloramine, a filter certified only for free chlorine may not do what you want. Before you buy, check which disinfectant your water contains and look for a specific, independently verified chloramine claim rather than general wording about "chlorine."^{Source [2]}^{Source [4]}

Do shower filters remove hard water minerals?

Generally, no. Hardness comes from calcium and magnesium. The Minnesota Department of Health (MDH) describes water softening, a cation-exchange system that swaps those minerals using salt, as the cheapest option for removing hardness.^{Source [5]} Shower filters certified to NSF/ANSI 177 are certified for chlorine reduction, not hardness.^{Source [2]}

Softeners have their own trade-offs. MDH notes that softening with sodium chloride adds sodium to the water and can affect how corrosive the water is.^{Source [5]}

What the research says about skin and hair

This is where marketing runs ahead of evidence.

Eczema. The strongest study here tested whole-home water softeners, not shower filters. In a randomized trial of 336 children with moderate to severe eczema living in hard water areas, eczema improved by 20% in the softener group and 22% in the usual care group after 12 weeks, a difference that was not meaningful.^{Source [6]} Parents in the softener group reported some small improvements, but the researchers said these were likely due to bias, because families knew which group they were in.^{Source [6]} This guide found no comparable trial of shower filters.

Hair strength. Lab studies on hard water and hair disagree:

A 2013 study soaked hair from 15 volunteers in hard water or distilled water on alternate days for 30 days and found no difference in strength or elasticity.^{Source [7]}
Two studies from the same research group in Pakistan, using hair from 76 and 70 men, found that hair treated with hard water was weaker than hair treated with deionized water.^{Source [8]}^{Source [9]}

These were lab tests on cut hair, not trials of people using shower filters, and most shower filters do not remove hardness anyway.^{Source [2]}^{Source [5]}

How well do the filters themselves work?

Independent performance data is thin. A small 2026 study in the Journal of Emerging Investigators, a journal for student research, measured chlorine before and after filtration under household flow rates.^{Source [10]} Two commercial filters both significantly reduced total residual chlorine. When the researchers tested filter materials one at a time, calcium sulfite performed about as well as the commercial filters, while KDF 55 and granular activated carbon removed only about 17% of chlorine at high flow.^{Source [10]}

Treat this as early, small-scale lab evidence. It suggests that the filter media matters, and that a busy shower gives water little contact time with some materials.^{Source [10]}

Maintenance

A shower filter with a spent cartridge does little. MDH notes that water treatment units that are not maintained lose their effectiveness over time.^{Source [5]} Use the replacement schedule on the label; for certified models, the NSF listing gives the rated capacity in gallons.^{Source [2]}

So, is a shower filter worth it?

Your situation	Is a shower filter worth it?
Your utility uses chlorine and you dislike the smell	Possibly; choose one certified to NSF/ANSI 177^{Source [1]}^{Source [4]}
Your utility uses chloramine	Only with a verified chloramine claim^{Source [2]}^{Source [4]}
You want softer water or less scale	No; look at a water softener instead^{Source [5]}
You hope to treat eczema	Evidence does not support it; a softener trial showed no added benefit^{Source [6]}
You want safer drinking water	Wrong tool; shower filters are certified for chlorine only^{Source [2]}

If your real goal is cleaner drinking water, a certified drinking water filter is a better fit. Start with our guides to choosing a water filter pitcher and whether fridge filters are worth it.

Frequently asked questions

Do shower filters actually work?

Some do, for one thing: chlorine. NSF/ANSI 177, the main certification for shower filters, verifies reduction of free chlorine. It does not cover hardness minerals, and products on the market are not federally regulated, so claims beyond chlorine are up to the maker.

Do shower filters remove chloramine?

Do not assume so. NSF/ANSI 177 covers free available chlorine, and every product on NSF's 177 listing as of Oct. 30, 2026 is certified for that claim only. If your utility uses chloramine, look for a specific, independently verified chloramine claim.

Will a shower filter soften hard water?

Generally no. Hardness comes from calcium and magnesium, and the Minnesota Department of Health describes a water softener, which swaps those minerals using salt, as the cheapest way to remove them. Shower filters certified to NSF/ANSI 177 are certified for chlorine reduction, not hardness.

Can a shower filter help eczema?

There is no good evidence that it does. In a trial of 336 children with eczema living in hard water areas, installing a whole-home water softener added no benefit over usual eczema care after 12 weeks. That trial tested softeners; this guide found no comparable trial of shower filters.

How often should you change a shower filter?

Follow the maker's rated capacity. NSF listings show a service cycle in gallons for each certified cartridge. The Minnesota Department of Health notes that water treatment units that are not maintained lose their effectiveness over time.