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 1959.
  • y_2020, m_7, d_13, h_15
  • bvseo_bulk, prod_bvrr, vn_bulk_3.0.10
  • cp_1, bvpage1
  • co_hasreviews, tv_184, tr_1775
  • 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, 68.49ms
  • 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–8PM CDT
  • SAT: 9AM–5PM CDT

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 Outstanding! Simple installation, no special tools needed and I can’t do without this filter now, I live in Co-op City in the Bronx, and we have our own water plant, Sotheby’s water is very hard & without this filter my skin reacts badly to the treatment of the water, within days my skin stopped itching.
Date published: 2020-05-25
Rated 5 out of 5 by from Skin feels better I have used this filter before- I do notice that without the filter, my skin seems more dry and itchy- especially on my back. With the filter, my skin does not seem to itch.
Date published: 2020-04-29
Rated 5 out of 5 by from Excellent filter This filter is amazing. I have used it for years with great success in keeping my hair healthy. I have peace of mind knowing that it is purifying the water I am showering in.
Date published: 2020-04-03
Rated 5 out of 5 by from Excellent Since putting our Aquasana water filter on my skin is softer and so is my hair. I use to have brittle hair and now it is soft and bouncy.
Date published: 2020-03-31
Rated 5 out of 5 by from Fantastic addition to the bath Within a week of installation, my family observed positive changes in skin and hair and the mineral deposits in the shower are gone. This is a great product and we highly recommend it. In fact, we bought shower filters for family members for Christmas!
Date published: 2020-01-30
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
  • y_2020, m_7, d_13, h_15
  • bvseo_bulk, prod_bvrr, vn_bulk_3.0.10
  • cp_1, bvpage1
  • co_hasreviews, tv_184, tr_1775
  • 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, 59.73ms
  • 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

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: 2019-11-12

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: 2019-10-06

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: 2020-03-30

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

The bottom of my shower filter is leaking big time like...sparying out like a shower on the bottom. I've only gotten 550 gallons usage out of it. Is it still going to benefit our hair and skin?

Asked by: Head
You should not have any spray other then your shower head. Sounds like you might have a cracked filter housing ? Double check all connections to make sure they are tight. Replace the unit if all connections are good and you still have water spraying from bottom of canister. Do not think its going to filter properly if this is happening.
Answered by: ironman
Date published: 2019-05-29

Can we recycle the used filter? 

Asked by: Ying
Hello Ying, We have designed this system to minimize the environmental impact of our replacement elements, which are over 95% biodegradable carbon. 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 Support
Answered by: Aquasana S
Date published: 2019-06-07

Will this replacement fit when I have been using AQ-4125?

Asked by: Nadine
Hello Nadine, Thank you for your question. Yes this filter will fit the AQ-4125. Thank you, Aquasana Support
Answered by: Aquasana S
Date published: 2019-04-29

Would you please send me a article or write up that lists the benefits that your filter's for the shower provides for a person's hair and skin. Please send it to the e-mail listed below. Thanks

Asked by: Sissy
The water where I live is quite hard, there's a lot of scale around fixtures and in the toilet as a result. This is filtered out by the shower filter and thus is not on me. I itch quite a bit less and my hair is softer. As to anything else it filters, I'm not aware of an obvious benefit but this is a cheap solution to getting at least some of the junk out.
Answered by: Kipperedsnack
Date published: 2019-04-06

Water leaks out of my filter where the cartridge joins the rests of the fixtured; am I missing a seal?

Asked by: ermadox
Hello, We are sorry you are having a problem with your filtration system. Please contact us at 866-662-6885 to help find the correct solution for your system. Thank you, Aquasana Support
Answered by: Aquasana S
Date published: 2019-03-28

What are the signs that the filter is no longer effective?

Asked by: CB108
my girlfiends blonde hair starts to tint red. And my white fiberglass shower pan starts to turn yellow.
Answered by: ironman
Date published: 2019-05-18

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: 2019-05-29

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: 2019-03-24

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: 2019-03-24

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: 2019-06-07

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: 2019-05-14

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: 2019-03-24

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: 2019-03-24

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: 2019-03-24

What chemicals does the AQ-4125 filter out?  Does it filter chloramine?

Asked by: Aquasane
Hello! Natural coconut shell carbon filters out chlorine and other harsh chemicals, while copper/zinc media further reduces chlorine and enhances water pH balance. The Aquasana shower filter improves air quality, enhances water pH and removes over 90% of chlorine for the healthiest shower experience. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2019-03-24

Are the replacement shower filters interchangeable with the shower filter without a shower head and the with a shower head. I would like to buy both shower filters if the replacement filter will work in both shower assemblies.

Asked by: Donovan
Absolutely! We only have one style of shower filter. We simply offer several options for your shower head. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2018-06-01

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: 2018-06-01

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: 2018-03-11

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
  • y_2020, m_7, d_14, h_15CST
  • bvseo_bulk, prod_bvqa, vn_bulk_3.0.10
  • cp_2, bvpage2n
  • co_hasquestionsanswers, tq_63
  • 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, 146.33ms
  • QUESTIONS, PRODUCT

To give you the best possible experience, our website uses cookies. You can review our privacy policy to find out more about the cookies we use and how to adjust your browser settings to block cookies. If you close this box or continue browsing our website, you accept our use of cookies.