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.
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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–8PM CDT
  • SAT: 9AM–5PM CDT

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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 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
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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

How long does a filter last before you need to replace it?

Asked by: Rachel Doe
Thank you for contacting us! The filter last up to 6-months before needing to be replaced. If you have any further questions please contact us at 866-662-6885. Thank you, -Aquasana Customer Support
Answered by: Aquasana S
Date published: 2020-06-30

How many times a year we have to replace the filter 

Asked by: Kreena
Good Afternoon, Thank you for your question. We recommend replacing the filter every 6-months, twice a year. If you have any further questions feel free to contact us at 866-662-6885. Thank you, Aquasana Customer Support
Answered by: Aquasana S
Date published: 2020-06-11

Do you sell the rubber washer that sits in the shower head connection to water source pipe?  I have leakage around that spot - the current washer appears damaged. thanks! Demian

Asked by: Demian
Demian, We would love to transfer this to a team specialist who is best-suited to answer any questions or concerns you may have. Kindly email us directly at support@aquasana.com or contact us directly at 866-662-6885, Monday thru Friday from 8am-6pm CST, and weekends from 9am-5pm CST. Thank you, Aquasana Support
Answered by: Aquasana S
Date published: 2020-05-14

How do you dispose of the filter at the end of its usage? Is it recyclable?

Asked by: msun
No way to recycle, sadly. It’s landfill. I only change the bottom part, not the attachment to the pipe and shower head. That cuts down in waste a fraction. 
Answered by: Kipperedsnack
Date published: 2020-04-22

Why is it more expensive to buy a replacement filter than if i purchase a premium shower filter itself. Makes no sense!

Asked by: Fla beachbum
Hello, Thank you for your question. Our shower filter replacement is set at the price of $ 52.50 and the shower filer premium is set at the price to $59.49. Please contact us if you have any further questions at 866-662-6885. Thank you, Aquasana Support
Answered by: Aquasana S
Date published: 2020-04-18

Does the filter remove PFOS and PFOA?

Asked by: Lisa B
Hello, PFOS AND PFAS, that you find in scotch guard or teflon in cookware. All of our drinking systems are NSF Certfiied for the removal of PFOS and PFAS.   If you need further assistance contact us at 866-662-6885. Thank you, Aquasana Support
Answered by: Aquasana S
Date published: 2020-01-22

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: 2020-04-17
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