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 great product I have been usung the shower filter for over 6 years I I love it!
Date published: 2017-12-04
Rated 5 out of 5 by from i will never not have this in my house forever I DON"T KNOW OF ANY OTHER FILTERS OR IF THERE IS AT ANY PRICE THAT FILTER HOT WATER, ITS A MIRACLE OF SCIENCE. TO SET THE PH OF THE WATER WITH THE CARBON FROM A COCONUT SHELL. darn RIGHT!!! AND TRANSFORM THE STEAM INTO SOMETHING BESIDES CHOLRINE GAS,. THIS WATER FILTER HAS IN TRUTH ALTERED MY IDEA OF HOW GREAT A SHOWER CAN BE. ITS A REMARKABLE THING BY A REMARKABLE COMPANY. 44 DOLLARS GETS YOU GOING FOR A YEAR THEN ITS 40 BUCKS PER YEAR AND THEY GET DELIVERED!! ALSO THERE IS NO LOSS OF WATER PRESSURE AND IF THERE IS ITS BECAUSE YOU HAVE SCREWED THE NOZZLE IN TO TIGHTLY. ITS A SHAME EVERYONE DOESN'T HAVE THIS, YOU THINK YOU DON'T NEED IT; BUT YOU ARE REALLY MISSING THE MOST REFRESHING SHOWER AVAILABLE IN THE WORLD TODAY! INSIDE A HOUSE IT FEELS LIKE A PRISITNE SPRING, AND YOU FEEL AS IF YOU JUST HAD A REFRESHING SWIM :) BUY THIS 100 TIMES BUY IT! YOUR SKIN IS TOO MPORTANT NOT TO HAVE IT, SAY GOOD BYE TO CHALKY SKIN. ITS AWESOME DON'T SOAK IN CHLORINE ANY LONGER ITS A HEALTH RISK
Date published: 2017-11-14
Rated 5 out of 5 by from Works great! We can't have a softener where we live, this shower filter helps soften the water better than any other.
Date published: 2017-10-24
Rated 5 out of 5 by from No Regrets A friend suggested I purchase an Aquasana filter for my shower and I did. The water in my community is well water and horribly hard. I rent a condo so wasn't going to purchase a water softener. I have noticed a HUGE difference in my skin and on my hair. Love the automatic shipment of a replacement filter every six months. One of the best purchases I have made!
Date published: 2017-10-06
Rated 5 out of 5 by from Better Shower Water We're happy with the shower filters. The water where we live is extremely hard and was not doing any favors for my hair or skin. But I noticed a positive difference right away in the water quality when I washed my hair after installing the filter the first time and also realized that I didn't have to go so hard with the lotion after taking a shower, as I previously had to do.
Date published: 2017-10-03
Rated 5 out of 5 by from easy installation and replacement We have used the filter for more than a year. It is quite easy for installation and replacement. It only takes about 1 minute or two.
Date published: 2017-10-02
Rated 5 out of 5 by from Shower filtration Had this for several years now. Very pleased. Have just converted to thd whole house filtration system.
Date published: 2017-10-02
Rated 5 out of 5 by from Love the filter! We have had this system for a couple of years now. We have well water and this really helps to clean our water. The main reason we purchased it was for our skin and hair. It does make a huge difference.
Date published: 2017-10-01
Rated 5 out of 5 by from VERY GOOD FILTER WE HAD USED THAT FILTER FOR MANY YEARS IN OUR SHOWERS. EXCELLENT PRODUCT.
Date published: 2017-09-30
Rated 5 out of 5 by from Saves My Skin Don't know what I'd do without this filter! The chlorine dries out my skin so badly and this helps immensely. Plus, no horrible smell of a swimming pool while showering.
Date published: 2017-09-30
Rated 5 out of 5 by from Great Water Product! Thanks I have been using Aquasana Shower and Drinking water Filters system for the last few years. I love it. We haven't been changing the filter every 6 months and our water is fine. So We were getting a build up of filters. So, I stopped the auto ship. I can't really afford the Water filters and the 2-Shower filters every 6 months. When I can I will call and get the auto ship started again. Just like I told them when I called and cancel my auto ship. I have all my emails and paper work. I will call and order or set up auto ship when I can afford it. So, Thanks. I don't need a lot of emails, maybe once a month at the most. It is like: Don't call me I will call you. Thanks for the Aquasana Filtration System. It makes our water taste so much better. Thanks again Paulette/Polly
Date published: 2017-09-29
Rated 5 out of 5 by from Hard water Have hard water where I live, tried different filters, but the Aqusana is the best by far. Hair and body feel cleaner, on automatic refill every six months haven't had a problem in 8 yrs. Customer service is friendly and helpful very knowledgeable.
Date published: 2017-09-29
Rated 5 out of 5 by from Clean feeling Have been using this for over a few years now. Skin feels so much better and hydrated. Really noticed the difference when we took a trip and had been away for a week. First thing we all said was that we couldn't wait to talk a real shower when we got home.
Date published: 2017-09-29
Rated 5 out of 5 by from best filter available I have been using the aquasana shower filter for over 3 years it has made a huge difference in everything form skin to hair, I'm extremely happy and I going to do my whole house with their system.
Date published: 2017-09-29
Rated 5 out of 5 by from easy to use I brought my initial filter last year and I enrolled in the 6 month filter subscription and it came on time packaged well and it was easy to install. I love my filter. I love the easy of everything about it
Date published: 2017-09-29
Rated 5 out of 5 by from Filters out the chlorine Been using the Aquasana shower filter for years. Started using it because my skin was itching. Evidently the chlorine needed to be filtered out.
Date published: 2017-09-29
Rated 5 out of 5 by from Fresh and Clean Tried em all, this is the best filter I have ever used.
Date published: 2017-09-29
Rated 5 out of 5 by from Refreshing fantastic product. It really cleans up the chemical smells from the tap water.
Date published: 2017-09-28
Rated 5 out of 5 by from Clean & Soft! I’ve been using it for 2 years, so clean and soft water you can feel and Smell the non chlorine fresh I recommend it to every household. I just wish it was lighter in weight that is the only negative
Date published: 2017-09-28
Rated 5 out of 5 by from Wonderful product....does what is supposed to do. I like the fact that it arrives automatically. It is very easy to install....
Date published: 2017-09-28
Rated 5 out of 5 by from The best Been using this for years. The best decision I've ever made
Date published: 2017-09-28
Rated 5 out of 5 by from Grat Features The product is very good and is doing what it is said to do. I love it.
Date published: 2017-09-28
Rated 5 out of 5 by from I've ordered this filter 4 times and it's great! I love this filter. I have really hard water and have been reordering for several years. My water is very hard, so it does need changing earlier, at around 4 1/2 or 5 months instead of 6, that's my only issue. Highly recommend!
Date published: 2017-09-28
Rated 5 out of 5 by from We love the shower filter. Bought it about 4 years ago when we first moved into apartment living. Really softens the city water.
Date published: 2017-09-28
Rated 5 out of 5 by from Shower filter Works great and so easy to install. Re shipped every 6 months automatically.
Date published: 2017-09-28
Rated 5 out of 5 by from New Skin Since using these filters my skin feels so much better! No more itchy skin! I filtered my drinking water but didn't realize how important it was to put on my shower for my skin!
Date published: 2017-09-28
Rated 5 out of 5 by from I like this filter because for me this is the best My water has low levels of lead in it and this filter is the only one that I have found that works for my needs.
Date published: 2017-09-26
Rated 5 out of 5 by from clean smell I enjoy not smelling the chlorine in the water as I'm bathing.
Date published: 2017-09-25
Rated 5 out of 5 by from perfect water im happy with aquasana great value. no more ashy skin.
Date published: 2017-09-25
Rated 5 out of 5 by from Helps with my Psoriasis I have been using this filter for over a year now and since having my Psoriasis, it has helped alleviate it. It isn't harsh on my skin or my scalp. It filters and removes all impurities or solids from the water that isn't good for my skin and scalp. It's the best investment I've made! I will continue using this product. I've recommended to others.
Date published: 2017-09-23
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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

Hello, I have a handheld shower (nothing special, normal PF brand, probbaly 1lb weight) and planning to attach it with the shower filter. will the shower filter hold the weight of it? what is the maximun will this hold?

Asked by: MohanD
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: 2019-12-04

How do I know when my shower filter needs to be replaced? What are the signs that I should watch for to know I need to get a new one? I am only person in my home I read you might be able to extend it to 12 months but how will I know still good or not?

Asked by: Single woman
Great question that everyone will answer differently. I always judge based on how my hair feels! If my hair starts feeling dry and lackluster I have my husband change it. Can be six months. Being a single user you no doubt can go longer. My husband will mention his skin feeling drier. Hope that helps.
Answered by: SMRTY
Date published: 2019-11-16

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
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