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 1949.
  • y_2018, m_12, d_17, h_23
  • bvseo_bulk, prod_bvrr, vn_bulk_2.0.9
  • cp_2, bvpage2n
  • co_hasreviews, tv_184, tr_1765
  • loc_en_US, sid_7, prod, sort_[SortEntry(order=RATING, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_aquasanaserviceteam
  • bvseo_sdk, p_sdk, 3.2.0
  • CLOUD, getAggregateRating, 37.46ms
  • REVIEWS, PRODUCT
  • 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

Learn More

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!"

Learn More

Read the Reviews

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
Rated 5 out of 5 by from Great for Sensitive Skin! I love Aquasana's filters, the water is beneficial to my sensitive skin in many ways, as i live out in the countryside and minerals are prominent in my water supply. This product has helped so much with my skin and thankfully it is not so easily irritated anymore.
Date published: 2017-09-23
  • y_2018, m_12, d_17, h_23
  • bvseo_bulk, prod_bvrr, vn_bulk_2.0.9
  • cp_2, bvpage2n
  • co_hasreviews, tv_184, tr_1765
  • loc_en_US, sid_7, prod, sort_[SortEntry(order=RATING, direction=DESCENDING), SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_aquasanaserviceteam
  • bvseo_sdk, p_sdk, 3.2.0
  • CLOUD, getReviews, 7.28ms
  • REVIEWS, PRODUCT

Learn More

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

Learn More

User Q & A

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

I bought this, but need a top to it for a handheld shower. Can I purchase that alone? 

Asked by: Jenknee
Hello! Yes! Please contact our customer service representatives at 866-662-6885 to order part needed. Thank you, Aquasana
Answered by: Aquasana Service Team
Date published: 2018-11-06

We have two homes and spend roughly 6 months at each location. Does this mean we should be able to replace each shower head filter once a year?

Asked by: Jim AZ
Thank you for your interest in Aquasana. We recommend changing the filters every six months. We base our estimates and requirements on the testing done by the NSF. In the case of our filtration systems, it is not always necessarily the amount of water that has passed through the system, but the amount of time that the filters have been in contact with Water. Keep in mind that while you may be using a minimal amount of water, the filters are constantly soaking in the water, waiting for a valve to open, and the water to resume flowing. We make suggestions based on the safest and healthiest way to maintain our systems. Once the filter starts to degrade due to elongated contact with water, you risk bacteria and mold growing inside the filter and the system: Heterotrophs (heterotrophic bacteria) are a group of microorganisms (yeast, molds & bacteria) that use organic carbon as food (as opposed to autotrophs like algae that use sunlight) and are found in every type of water.
Answered by: Aquasana Service Team
Date published: 2018-09-21

Can I put the used filters in the recyle bin?

Asked by: SteveM
While the plastic is recyclable, we are not aware of recycling plants accepting carbon filters. You should check with your local recycling company.
Answered by: Aquasana Service Team
Date published: 2018-08-17

Does your shower unit filter out fluoride? If not, will you be making a unit that filters out fluoride? Please, don't say you leave the fluoride behind because its good, it was finally labeled as as neurotoxin. I appreciate the feedback Thank you, JP

Asked by: Peezy
I have been using the Aquasana shower filters for a number of years. As far as I know, the shower filters are not engineered to filter out fluoride. Perhaps the drinking ones do-- I don't use one so I cannot recommend a brand to you.
Answered by: Neilleyonline
Date published: 2018-07-02

The shower head of the shower filter system leaks non-stop. We replaced the head with a new one and it still leaks. Do you have any recommendations on how to make the leak stop?

Asked by: Stacy
pluming tape 
Answered by: gilberto
Date published: 2018-08-18

Is there an indicator that signals when to change the filter as my usage would be less than stated during the 6 months

Asked by: Janine2
There is no audible or visual signal, but you should be able to tell by the feel of the water on your skin. There is a big different feel to the soft water!
Answered by: Winelover
Date published: 2018-10-27

what % or estimated amount of chloramine is removed using one of your suggested shower filter cartridges. A part number and details of the media used would be helpful. For chloramine filters, how often do you recommend changing the filters.

Asked by: Philly
Hello, The chloramine shower filter contains catalytic carbon, and reduces approximately 75% of chloraimines in your water. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2018-06-15
  • y_2018, m_12, d_17, h_23CST
  • bvseo_bulk, prod_bvqa, vn_bulk_2.0.9
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_31
  • loc_en_US, sid_7, prod, sort_[SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_aquasanaserviceteam
  • bvseo_sdk, p_sdk, 3.2.0
  • CLOUD, getContent, 4.6ms
  • QUESTIONS, PRODUCT