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 1930.
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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 CST
  • SAT–SUN: 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 1 out of 5 by from Cheap Plastic Broke The 1st time I attached the filter to my shower pipe from the wall, not after time from use, it cracked & leaked. The threads are cheap plastic.
Date published: 2017-10-05
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
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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

I have had the shower replacement for about two years now and never replaced the filter. Do you suggest I get the whole thing new again or just buy replacement? 

Asked by: Erikas137
Hello! You should be able to just replace the shower filter itself. If you have any questions or concerns feel free to give us a call at 866.662.6885 and we will be happy to help! Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2017-12-05

Does this filter reduce the iron content of the filtered water

Asked by: arthur121340
I have not check the iron content of my water since installing the Aquasana filters, but as far as I am concerned after researching other systems, this is the best you can get. I am very happy with the filters and the service provided is excellent. I also like the fact that the water doesn't taste filtered, and that the filters can be sent automatically for a cheaper price!
Answered by: Winelover
Date published: 2017-12-01

I have a family of three. At three showers a day how long would the filter last?

Asked by: good hair wanted
Well, we do two showers/day with a marvelous low flow 1.6 gpm shower head and replaced filter at 1 year. Only replaced as updating other filters for drinking water. Tested for clorene with a pool tester to see if it is still working. Recommend You get an inexpensive whole house filter from Your local hardware store with a high pass through carbon filter. Then test the shower water with an inexpensive swimming pool test kit for clorene and ph. Should have next to zero clorene and a ph around 7 or 8. We use the Aquasana on our just moved into tiny home as a whole house was more difficult to install. Used the whole house in our previous big home. If You still need carbon in the shower, consider installing the Aquasana on the water line to Your shower rather than hanging it from the showerhead pipe. Less strain on the pipe above Your head. That's how we did it. Hope this helps. By the way, use the pool tester on incoming drinking water too. You'll be happy with the before and after effects of eliminating clorene and balancing ph!
Answered by: Prometheus
Date published: 2017-11-27

I have been using this filter (aq-4100/4105) for years, because I'm on a well that is heavy in iron. My first line of defense is a whole house softener, with this being secondary. Are you now saying this is not the correct filter for hard well water?

Asked by: AMU*
I have very hard well. water with no softener installed. Works great for my shower. Only issue is it does not last very long. Because of how hard my water is. But for first 2 months its the difference between night and day. I would say yes this is the correct filter for hard water. And with a softener installed up stream. This filter should last a lot longer then it does at my house.
Answered by: ironman
Date published: 2017-11-25

Do you have any promo's or sales coming up?  I need a cartridge replacement

Asked by: Miriam
Miriam, thank you for your question. We do not run sales or promotions on our replacement filters. However, if you opt to enroll in our Water For Life program, you will receive a 15% discount + free shipping on all replacement filters. - http://www.aquasana.com/water-for-life Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2017-10-11

How do I know when a new filter for my shower is needed? When I turn it on the water runs dark for a few minutes. Is that normal?

Asked by: bella
Hi Bella, There are a couple things that can cause that surge of dark water when you turn the system on. If it is a new filter, then this is just the excess carbon being flushed out, and should resolve itself after a week or so. If it is an older filter, then it is just sediment that has been trapped inside the filter. When you turn the water on, that initial surge of water can force that trapped dirt out. We suggest changing the filter every 6 months to ensure that the filtration media does not start to degrade. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2017-08-04

are all the replacement filters the same price.is there any kind of penalty for stopping auto filter delivery.

Asked by: sc64
Thank you for your interest in Aquasana! We currently only have 3 types of shower filters. The one which can be purchased online is intended for use with water treated by chlorine. If your city uses a combination of chlorine and ammonia (chloramines) or if you are on well water, you can call into 866.662.6885 and request a special filter be sent out. All of these filters will be the same price on Water for Life ($44.62). You can cancel this program at any time with no penalty. However, if you enroll in the program with one of our BOGO offers and receive a free product, we will ask that you either send back or pay for the free product if you cancel prior to your first Water for Life shipment. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2017-07-27

Is it available in Bahrain?and how much the cartridge?

Asked by: Manal
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