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–7PM CST
  • SAT: 9AM–5PM CST

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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

Do I have to unscrew the whole shower unit off the water pipe in wall in order to replace the new cartridge or can I just unscrew the cartridge at the bottom and screw it back on?

Asked by: Single woman
Hello, Thank you for your question. I have provided filter instructions down below. http://cdn.aquasana.com/assets/AQ-4125_Replacement.pdf?_ga=2.181291751.1186919928.1573485699-1576935854.1541435505&_gac=1.216860322.1571935014.EAIaIQobChMI3Mur_pG15QIVg56zCh2kAQ5UEAYYASABEgK76fD_BwE If you need further assistance contact us at 866-662-6885. Thank you, Aquasana Support
Answered by: Aquasana S
Date published: 2019-11-11

I live in the city of Milwaukee, which uses chloramination, so I need a filter that is specifically rated for chloramine removal and not free chlorine. Do you have a shower filter for chloramine removal? If so, do you have performance test data?

Asked by: Chloramine Confusion
Hello, Thank you for your questions. Yes have a shower system designed for chloramine reduction, however it is not available on our website and must be ordered by calling to 866.662.6885. Thank you, -Aquasana Support
Answered by: Aquasana S
Date published: 2019-09-03

I just received my shower filter and it is leaking from the nut where it attaches from the wall pipe. It is not leaking from the pipe. I have used telfon tape, but the where the silver nut and filter meet. Water is sprying all over. Please help.

Asked by: Khanh
My husband says to make sure the washer is In and tighten really tight. He had this issue but you must use the included washer.
Answered by: SMRTY
Date published: 2019-08-24

If there is only one person in the household. Does the shower filter still have to be changed every 6 months?

Asked by: Cecile
It depends on how much iron you have in your water?And how much usage the shower gets? I have very hard water and two people in the household. I have to change my filter every 3 to 4 months.
Answered by: ironman
Date published: 2019-08-23

I know these filters are supposed to last 6 months but I have very hard very chlorinated water in Phoenix. Is it suggested to replace more often?

Asked by: Nekowafer
Hello, It appears you have several questions that would best be answered by a consultation with one of our experts over the phone. Please call our sales department at 866-662-6885, options 1 and 1 to discuss a potential solution for your home. Thank you, Aquasana Support
Answered by: Aquasana S
Date published: 2019-07-29

Hi. Is there any expiration to the replacement filter? Can I buy the replacement filter with the purchase of Aquasana now and store it or should I buy the replacement filter after 5-6 months of use?

Asked by: Avinash
I don’t know the official answer...but when we install a new one we immediately order another one so it is on hand. So it is on hand anywhere from 6-8 months...never had an issue after doing this for about 9 years now.
Answered by: SMRTY
Date published: 2019-07-22

Does it have sulfur in it?

Asked by: TRACYJOWRIGHT
Hello, No, the shower replacement cartridge does not contain Sulfur. Thank you, Aquasana Support
Answered by: Aquasana S
Date published: 2019-07-11

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
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