Shower Filter Replacement
AQ-4125 Shower Filter Replacement

Replacement filters for the Aquasana Shower Filter Systems

AQ-4100 shower filter

This replaces filters in the Shower Filters (AQ-4100, AQ-4100NSH and AQ-4105).

Replacement Filter for Aquasana Shower Filters is rated 4.7 out of 5 by 1952.
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  • MSRP: 52.50

Save 15% + free shipping with Water for Life $44.62

Questions? We can help

  • 866-662-6885
  • MON–FRI: 8AM–6PM CDT
  • SAT–SUN: 9AM–5PM CDT

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The BPA free, two-stage filter lasts six months, reduces chlorine and harmful chemical vapors, enhances pH balance, prevents soap scum build-up, and provides the highest quality shower water for the cleanest, healthiest shower experience.

Replacement filter for Aquasana shower filters. Comes with easy-to-follow replacement instructions.

Two-stage filter lasts 6 months, reduces chlorine and VOCs, enhances pH balance, prevents soap scum build-up and provides the very highest-quality shower water.

"It's like showering in natural spring water!"

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Read the Reviews

Rated 5 out of 5 by from Nice I like how it filters out the hard water we have. Makes showering pleasant.
Date published: 2019-04-28
Rated 5 out of 5 by from Great Filter! Works well! I have had the Aquasana shower filter head with replaceable filters for many years now. I am very pleased and recently signed up for the auto renew for my filters. I feel that the quality of the water when I shower is better and experience the difference,
Date published: 2018-04-11
Rated 5 out of 5 by from Does the job as I desired We have used this shower head with yearly filter replacement for many years. Before we started using this filter, our shower showed an orange color residue in corners & edges. Possibly from old pipes. Since using Aquasana, no orang residue & a shower stayed clean!
Date published: 2018-04-10
Rated 5 out of 5 by from Made a differance This is our second one, we were undecided what to do because the water here in Sun City is horrible. We use to have to scrub our shower more then once a week and our shower curtain would just get stiff from all the bad chemicals in the water. This filter has made a big impact and will continue to use them
Date published: 2018-03-21
Rated 5 out of 5 by from I have been using this filter for a number of year I have used this filter for years, easy to change and does a great job, you can feel the water has a different feel by taking the bad stuff out.
Date published: 2018-03-08
Rated 5 out of 5 by from AWESOME!!!! Easy to install. Shower rain is stronger than before. I did buy some Teflon to ensure that there would not be any leaks. So far everything works perfectly. My sister has already purchased hers.
Date published: 2018-03-07
Rated 5 out of 5 by from I love the features looks great. I purchase this a couple of weeks ago but it leaks when I connect my own shower head to it. Other than that I love this product, I will try to workout the leak. Over all keep up the good work, I'm unable to send pictures of unit due to low memory of cellphone.
Date published: 2018-03-07
Rated 5 out of 5 by from quick install for long lasting relief this shower filter is quick to install than others filters I have try and from the first my skin and hair have shown much improvement.
Date published: 2018-02-23
Rated 5 out of 5 by from No more tangles! I love my Aquasana shower water filter. My hair is softer and less tangled. L.A.’s hard water had been ruining my hair. Thanks Aquasana.
Date published: 2017-12-25
Rated 5 out of 5 by from Easy to install; works great! This is my second filter from Aquasana. I have been very happy with them.
Date published: 2017-12-18
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Aquasana FAQs

  1. Do I have to pay for a plumber to install the system?

    Aquasana shower systems are very easy to install, and you can do it yourself in minutes. No plumber is necessary. If you have any questions or need assistance, our technical support representatives at 866-662-6885 can walk you through the installation process.

  2. What is the flow rate of the AQ-4100, AQ-4100NSH, & AQ-4105?

    The optimum flow rate for the filter and shower head is 2.5 gallons per minute.

  3. Can I use my own shower head or hand-held wand with the AQ-4100?

    Yes, you can use your own shower head. The AQ-4100NSH is the correct model for individuals using their own shower head. Just remember the shower head needs to have the same 1/2 inch connection as standard shower heads and the ideal flow rate would be 2.5 gallons per minute. If your shower head processes more than a 2.5 gallon flow rate per minute, the quality of filtration may degrade slightly. Increasing the flow rate by changing the shower head reduces contact time with the media and will reduce the filtration quality. If you decrease the flow rate of the system by using a different shower head, or use a shower head with a shut-off switch, you may cause damage to the system and void your warranty.

  4. Can I use the shower system for drinking water?

    Drinking some of the water during your shower poses no health risk. However, Aquasana does not recommend that you use the shower system as a primary drinking water source since it is not designed as a drinking system and has only been tested under shower conditions and regulations.

  5. Can I hook the shower system up under a constant pressure application?

    No, the shower system is designed to allow the water to consistently pass through the system as it filters. If the system is under constant pressure and unable to release the pressure introduced into the system during filtration, damage can occur to the unit.

  6. How do I know if the Aquasana shower system will fit the shower pipe coming out of my wall?

    Most shower connections are 1/2 inch, which means that the Aquasana shower systems will fit the shower pipe in most homes.

  7. How much chlorine does the shower system remove?

    Aquasana shower systems are tested to remove 91% chlorine for 10,000 gallons.

  8. How do I know how many showers it takes to use 10,000 gallons?

    10,000 gallons at 2 1/2 gallons per minute = 4,000 minutes of showering
    - You can take 400 10-minute showers
    - You can take 267 15-minute showers

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User Q & A

have you found a way to reuse/recycle the filters yet? I would open another account for a shower filter if I didn't have to add this heavy plastic filter case to the landfill every six months. How can you not resuse this hard plastic case??

Asked by: Kitkat314
Hello, Unfortunately, we do not offer a recycle program at this time. After careful research and consideration, we've discovered it's more harmful to the environment to have our customer's ship back the product. The fossil fuels involved with this process and the energy used to recycle would be counter-productive. You should be able to put the filter(s) in with the other plastic in your recyclables.The carbon is not at all harmful to the environment. Hope this helps! -Aquasana Customer Support
Answered by: -ACS
Date published: 2019-06-14

The bottom of my shower filter is leaking big time like...sparying out like a shower on the bottom. I've only gotten 550 gallons usage out of it. Is it still going to benefit our hair and skin?

Asked by: Head
You should not have any spray other then your shower head. Sounds like you might have a cracked filter housing ? Double check all connections to make sure they are tight. Replace the unit if all connections are good and you still have water spraying from bottom of canister. Do not think its going to filter properly if this is happening.
Answered by: ironman
Date published: 2019-05-24

Can we recycle the used filter? 

Asked by: Ying
Hello Ying, We have designed this system to minimize the environmental impact of our replacement elements, which are over 95% biodegradable carbon. In reality, the environmental impact of shipping the filters back to us outweighs the good of recycling. Since the shower filter is made of a hard plastic that makes accessing the carbon very difficult,you will need to recycle the entire piece. Just check with your city, and as long as they accept polypropylene, you can just put the filter in your normal recycling bin. Thank you, Aquasana Support
Answered by: Aquasana S
Date published: 2019-04-29

Will this replacement fit when I have been using AQ-4125?

Asked by: Nadine
Hello Nadine, Thank you for your question. Yes this filter will fit the AQ-4125. Thank you, Aquasana Support
Answered by: Aquasana S
Date published: 2019-04-29

Would you please send me a article or write up that lists the benefits that your filter's for the shower provides for a person's hair and skin. Please send it to the e-mail listed below. Thanks

Asked by: Sissy
The water where I live is quite hard, there's a lot of scale around fixtures and in the toilet as a result. This is filtered out by the shower filter and thus is not on me. I itch quite a bit less and my hair is softer. As to anything else it filters, I'm not aware of an obvious benefit but this is a cheap solution to getting at least some of the junk out.
Answered by: Kipperedsnack
Date published: 2019-04-06

Water leaks out of my filter where the cartridge joins the rests of the fixtured; am I missing a seal?

Asked by: ermadox
Hello, We are sorry you are having a problem with your filtration system. Please contact us at 866-662-6885 to help find the correct solution for your system. Thank you, Aquasana Support
Answered by: Aquasana S
Date published: 2019-03-28

What are the signs that the filter is no longer effective?

Asked by: CB108
my girlfiends blonde hair starts to tint red. And my white fiberglass shower pan starts to turn yellow.
Answered by: ironman
Date published: 2019-03-08

Does this shower filter out iron?  We have large concentrations of iron in our water (not well water) that leaves an orange sludge on shower curtain.  Hair also feels dirty one day after washing and skin is dry.

Asked by: KellyAnn
Unfortunately, the shower system should not be a consideration for removing iron. After hardness in well water, iron is the most common water problem dealt with by homeowners with well water. Unfortunately, iron is also difficult to treat to a satisfactory level. This difficulty is due to the fact that iron can be found in well water in several forms, each of which may require a different water treatment for removal or control. Other factors, like the pH level of the well water, will also affect how successful a well water treatment approach will be.
Answered by: Aquasana Service Team
Date published: 2018-12-09
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