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 1935.
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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: 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 4 out of 5 by from Efficient filter I've bought several Aquasana showerheads and filters over the last 8 years or so. While I'm happy with the performance of the filter, the shower heads seem to get clogged and are difficult to unclog. When I ordered the last filter - over the phone - the person told me that the new filter would eventually clean out the clogs in the head. It hasn't. My wife and I are still satisfied with the products, but are concerned that we will have to replace the showerhead every year or so. No big deal, I guess.
Date published: 2018-02-10
Rated 2 out of 5 by from They should reward repeat customers As they advise to maintain high water quality, I've bought a shower filter from them every 6 months for 4+ years. It works well and seems to last beyond 6 months sometimes, but they never offer a discount to me as a repeat customer. The only way I can get a % off is to do Water for Life, which they should realize is not going to work for every customer to be auto charged. I want to control when I'm charged. So I think a discount should be based not on just a subscription but on how many purchases of the same product I've made.
Date published: 2018-02-09
Rated 3 out of 5 by from Ugh, mixed bag, will probably be swithchin I have bought multiples of these filters. One problem is once your filter starts leaking out the sides in between where the filter screws in it becomes a permanent condition that will happen with every subsequent filter you install. And eventually I get to a filter that I can't unscrew. When they are new they are the best thing in the world. The last one I purchased started leaking with the second filter I installed, and now I'm trying to unscrew the third and it won't come off. I've asked other people for help but nobody can get it to budge. Yet it still leaks. So I've really lost my previous enthusiasm for this product.
Date published: 2018-01-09
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
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
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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

Where does the old filter go once replaced? Can it be recycled.

Asked by: Gomelmeier
We have designed this system to minimize the environmental impact of our replacement elements, which are over 95% biodegradable carbon. Our company will recycle the filters for you, but we do not cover the shipping cost to return the filters back to us. 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
Answered by: Aquasana Customer Support
Date published: 2018-01-17

I'm trying to take the old filter off and it won't budge. Any sugesstions to remove it would be appreciated.

Asked by: Celeste
We found that hard water build up made it difficult to remove the filter so we ran it under hot tap water which allowed us to loosen it. You may also want to soak it in water and white vinegar to help dissolve the mineral build up.
Answered by: Sunset
Date published: 2018-01-15

what's the item or part # for the shower filter replacement that removes chloramines?

Asked by: kj07
This shower filter will remove chlorine or chloramines. Due to the harsh nature of chloramines, it takes more media power to remove them. Due to this, you may just need to replace the filter more often.
Answered by: Aquasana Customer Support
Date published: 2018-01-21

Lab report ?

Asked by: Trucker
You can view any of our Aquasana performance data sheets at www.aquasana.com/performance. For this specific product, you can visit this link to view the PDF: http://cdn.aquasana.com/assets/660-UL-FAC-R1.pdf. Please let us know if you have any additional questions!
Answered by: Aquasana Customer Support
Date published: 2018-01-11

What is the approximate size of this filter cartridge?

Asked by: Beegirl
6" tall, 2 1/2" x3 1/2" - for the filter only. The cap adds another 2 1/4" to the height.
Answered by: Winelover
Date published: 2018-01-09

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
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