How to Install a Shower Filter on the Shower Arm

Do Shower Filters Remove Chlorine? Vitamin C Explained

ByKen

As an Amazon Associate we earn from qualifying purchases.

Do chlorine shower filters really work? Some do, but only for the test they were run against. The Brondell FF-15 cartridge sheet says its system was tested to NSF/ANSI 177 for free available chlorine, and that it “has not been evaluated” for chlorine reduction in the presence of chloramines. The Multipure Aquashower manual says its filter “effectively reduces free chlorine only.” Vitamin C is a different case. The sources we opened do not establish that vitamin C removes chlorine or chloramine from shower water at any stated level, so this guide does not make that claim. The sections below cover what the test names mean, how to swap a cartridge or install a housing, and when to replace the filter.

Quick answer

  • Chlorine shower filters work only for the test they name. The sources we opened describe two shower filters certified to NSF/ANSI 177 for free available chlorine, and both sheets say the testing was done under standard laboratory conditions.
  • Chloramine is a separate question. The Brondell sheet says its NSF/ANSI 177 result does not cover chloramine.
  • The sources we opened do not establish a vitamin C shower filter’s chlorine or chloramine removal. Treat any vitamin C claim as the maker’s claim until a named test and result are shown.
  • Follow the maker’s flush step and replacement rule. Brondell says to replace its cartridge when there is a reduction of flow, and Multipure treats a drip at the housing cap as a sign the cartridge is past changing time.

Do chlorine shower filters really work?

The answer depends on the test. The EPA’s WaterSense guide to selecting water treatment systems makes a general point: “Many treatment devices can remove chlorine to improve water taste and odor.” The same guide tells readers to choose a product certified to a named standard, and it lists NSF/ANSI 42, which it says “addresses products that improve taste and odor.” That standard covers aesthetic effects. It tells you how a product performed on taste and odor. It does not tell you how the product performs on every contaminant a shower filter may be sold for.

The guide’s point-of-entry section mentions showering. It says a whole-house system treats water “at the point the water enters the building” for “all uses,” including showering, and it adds that such systems “may require plumbing alterations and professional maintenance services.” A cartridge in a shower head is a different job. The guide does not address shower filters directly.

Chlorine and chloramine: why the test matters

Utilities disinfect with chlorine or with chloramine, and a filter that handles one may not handle the other. The Brondell sheet gives its test challenge plainly: 2 mg/L of free available chlorine, with a minimum reduction of at least 50 percent. It then says the system “has not been evaluated” for free available chlorine reduction in the presence of chloramines, and that chloramines in the supply may affect performance. The sheet tells readers to contact the local water utility to find out whether chloramines are used in their water.

The Multipure manual raises a testing problem as well. It warns that chloramine “will also produce erroneous test results” when a home pool kit is used to check chlorine, and that such a kit may show “little or no free chlorine reduction.” Its advice is to use “the amperometric titration test method” for accurate free chlorine readings. The same manual says that “No KDF or carbon shower filter can remove 100% of the free chlorine.” A home reading is therefore a poor way to judge a shower filter, and a percentage on a box needs the test behind it.

What carbon and other media can and cannot show

The University of Nebraska-Lincoln extension guide says “Activated carbon filtration can effectively reduce certain organic compounds and chlorine” in drinking water. That is a statement about activated carbon in household systems, not about a shower cartridge. The NDSU extension page separates carbon types and says “Catalytic carbon is an advanced activated-carbon product designed to adsorb chloramines.” Catalytic carbon is therefore a different product from standard activated carbon, and a chloramine claim should name the carbon type behind it.

Multipure uses a different medium. Its manual names KDF 55 and describes a reaction that “changes chlorine from an element to a harmless compound.” That is the manufacturer’s account of its own media, and it does not describe vitamin C.

Vitamin C shower filters: what the sources do and do not establish

Vitamin C is ascorbic acid. The EPA Science Inventory record 61610, a 2001 conference presentation on mutagenicity testing, describes ascorbic acid as a dechlorinating agent. The authors were looking for an agent that “will react rapidly with residual chlorine” in water samples. The work concerns chlorinated water samples concentrated on XAD resin before mutagenicity testing. It is laboratory sample preparation. It does not describe a shower cartridge, and it gives no chlorine removal figure for one.

The two shower-filter sheets we opened do not mention vitamin C or ascorbic acid. Brondell’s sheets describe NSF/ANSI 177 testing for free available chlorine, and Multipure’s manual names KDF 55 as its media. Neither document supports a vitamin C claim, and the carbon sources above do not name vitamin C either.

The sources we opened do not establish that a vitamin C shower cartridge removes chlorine or chloramine in a shower, at any rate, or to any standard. If a product makes that claim, ask for the named test standard, the contaminant, and the test result. Then check whether the claim comes from the maker or from an independent test.

Installing a shower filter

There are two jobs. A cartridge swap happens inside a housing that is already installed. A housing install puts the filter between the shower arm and the shower head. Each has its own steps, and the sources we opened do not cover every product. Read the instructions that came with your filter first. The steps below come from the Brondell sheets and the Multipure manual, which are written for those products.

How to swap a shower filter cartridge

The Brondell FF-15 sheet says rubber gloves are “recommended to help get a better grip on the housing,” so use them if you have them. Then follow this sequence.

  • Hold the back half of the shower head with one hand. Turn the front half counter-clockwise with the other until the two halves separate.
  • Pull the used cartridge out of the housing in the back half.
  • Place the new cartridge in the housing. The sheet says the cartridge “can be installed either side up.”
  • Screw the two halves back together tightly.
  • Turn the water on, check for leaks, and tighten the connection as needed.
  • Flush the cartridge by running the shower for 2 minutes, or until the water runs clear.

The Multipure manual uses a similar flush step. It says to “Allow the water to run through the filter for 30 to 60 seconds” before first use. Use whichever flush time your own manual gives.

How to put on a shower filter housing

The Brondell FSH25 sheet describes a full install. Remove the existing shower head by turning it counter-clockwise, and clean any debris from the threads on the shower arm. Wrap the included plumber’s tape “tightly around the shower arm threads” two or three times. Hold the head up to the shower pipe and turn it clockwise by hand until it is tight. Use an adjustable wrench only if the connection still leaks.

The same sheet gives the warning that matters most: “Do not over-tighten the Inlet Collar.” It says over-tightening can compress the rubber washer into the shower arm and cause leaking. If that happens, remove the head, reinstall the washer, and reconnect it.

The Multipure manual gives a different tape instruction. It says “Firm hand tightening without plumber’s tape should be sufficient for leak free operation,” and it adds “DO NOT OVER TIGHTEN.” The two manuals disagree on tape. Follow the manual that came with your filter, and do not add tape where the maker says hand tightening is enough.

Before you start, turn off the water to the shower or close the supply valve, and do not over-tighten any fitting. If the shower arm itself leaks, or the valve behind the wall needs work, stop and call a licensed plumber. A filter swap should not need plumbing beyond the head and its connection.

Using a shower filter safely

The Brondell FF-15 sheet says “The system is not to be used for drinking water purposes.” The Multipure manual says its filter is “not intended as a drinking water filter.” Treat a shower filter as a shower product, not as a drinking-water device.

Temperature is a safety point. The Brondell sheet says “The water temperature should never be set above 120°F (49°C).” It warns against using the product with a shower valve that lets the water become too hot. Set the hot water at or below that limit, and check the valve if the water runs hotter than you expect.

Replacement timing has three signals in these sources. Brondell rates its FF-15 cartridge at “10,000 gallons, or six months of use.” Its sheet also says to replace the cartridge “when rated capacity is reached, or when there is a reduction of flow.” The Multipure manual explains that a clogged cartridge with reduced flow can cause a leak or drip at the cap, and calls that drip “a signal that the cartridge is past changing time.” Use the rating printed for your own cartridge, and treat a drip or a slower flow as a reason to check the cartridge now.

Shower filters and disinfection byproducts

The EPA archived fact sheet lists disinfection byproducts among contaminants that “may pose a risk when inhaled, such as when showering.” It adds that a point-of-entry device “can reduce concentrations of these contaminants.” The fact sheet gives no showering level and no removal figure for a shower filter. The sources therefore do not show that a shower filter reduces these byproducts, and this guide does not assume it does.

How we chose

We opened eight pages on 2026-10-23. Three are EPA pages: the WaterSense treatment guide, an archived filtration fact sheet, and a Science Inventory record. Two are Brondell installation sheets, one is the Multipure Aquashower manual, and two are university extension pages from UNL and NDSU. We kept each one because it states a test, an install step, a replacement rule or a mechanism in its own words. We did not rank products, and we did not use retail product pages, blogs or encyclopedias as sources.

What we could not verify: what the sources do not say

  • No source we opened gives a chlorine or chloramine removal figure for a vitamin C shower cartridge, and none names a shower test standard for vitamin C.
  • The Brondell sheets and the Multipure manual do not mention vitamin C or ascorbic acid.
  • No source we opened shows that a shower filter reduces disinfection byproducts at the shower.
  • No source we opened gives a skin or hair result from a shower filter. This guide makes no such claim.
  • The EPA WaterSense guide does not address shower filters directly.
  • The manufacturers’ results come from laboratory conditions. The Brondell sheet says “Actual performance may vary.”

FAQ

Does a vitamin C shower filter remove chloramine?

The sources we opened do not establish it. Brondell’s NSF/ANSI 177 result says the system has not been evaluated in the presence of chloramines. NDSU describes catalytic carbon as designed to adsorb chloramines, but that is a different carbon type, and the sources do not show that a vitamin C cartridge uses it. Ask the maker for the test standard and result before you rely on a chloramine claim.

Should I put tape on the shower filter threads?

Follow the maker’s manual. The Brondell FSH25 sheet calls for plumber’s tape wrapped two or three times, while the Multipure manual says firm hand tightening without tape should be sufficient. Both warn against over-tightening, and that warning matters more than the tape.

How often should I change a shower filter cartridge?

Use the rating printed for your own cartridge. Brondell’s FF-15 sheet gives 10,000 gallons or six months of use. Multipure’s manual treats a drip at the housing cap, which can follow reduced flow from a clogged cartridge, as a sign the cartridge is past changing time. Do not apply one maker’s rating to another maker’s cartridge.

Can I use a shower filter for drinking water?

The sources say no. The Brondell sheet says the system “is not to be used for drinking water purposes,” and Multipure says its filter is “not intended as a drinking water filter.” If you want to filter drinking water, use a product rated for that purpose and follow its own instructions.

Is chlorine in shower water a health problem?

The EPA archived fact sheet lists disinfection byproducts among contaminants that “may pose a risk when inhaled, such as when showering,” but it gives no showering level. For questions about your own water, start with your water utility and your local or state health department. A shower product does not answer that question.

Bottom line

Buy a shower filter for the test it names, not for the word “chlorine” on the box. For a vitamin C cartridge, the sources we opened do not establish chlorine or chloramine removal, so treat that claim as the maker’s until a named standard and a result are shown. Install the filter as its manual says, flush it, and replace it at the printed interval or when flow drops.

If your question is about low flow rather than chlorine, see our guide to showerheads for low water pressure. For a water-saving head that still gives a strong spray, see our guide to high-pressure, water-saving shower heads.

Sources

  • U.S. EPA, WaterSense Guide to Selecting Water Treatment Systems (ws-products-home-water-treatment-guide_v2_508.pdf). https://www.epa.gov/system/files/documents/2025-01/ws-products-home-water-treatment-guide_v2_508.pdf (opened 2026-10-23).
  • U.S. EPA, archived Filtration fact sheet (fs_healthseries_filtration.pdf). https://archive.epa.gov/dclead/web/pdf/fs_healthseries_filtration.pdf (opened 2026-10-23).
  • Brondell, FF-15 replacement cartridge installation and performance sheet. https://www.brondell.com/content/FF15_installation-instructions.pdf (opened 2026-10-23).
  • Brondell, VivaSpring FSH25 filtered shower head installation sheet. https://www.brondell.com/content/Brondell_ShowerFiltration_Filtered_Shower_Filter.pdf (opened 2026-10-23).
  • Multipure, Aquashower filter manual. https://www.Multipure.com/content/mp-aquashower-manual.pdf (opened 2026-10-23).
  • U.S. EPA Science Inventory, record 61610, ascorbic acid as a dechlorinating agent. https://cfpub.epa.gov/si/si_public_record_Report.cfm?LAB=NRMRL&dirEntryID=61610 (opened 2026-10-23).
  • University of Nebraska-Lincoln Extension, G1489 Drinking Water Treatment: Activated Carbon Filtration. https://extensionpubs.unl.edu/publication/g1489/na/html/view (opened 2026-10-23).
  • North Dakota State University Extension, Filtration: Sediment, Activated Carbon, and Mixed Media. https://www.ndsu.edu/agriculture/extension/publications/filtration-sediment-activated-carbon-and-mixed-media (opened 2026-10-23).

Similar Posts