Countertop/Under Counter Filter Replacement
AQ-4035 Water Filter Replacement

Replacement filters for the Aquasana Drinking Water Filter Systems

AQ-4000, AQ-4500, AQ-4501, AQ-4600 and AQ-4601 water filters

This replaces filters in the Countertop Filter (AQ-4000), and older Under Counter Systems (AQ-4500, AQ-4501, AQ-4600 and AQ-4601).

AQ-4035 Drinking Water Replacements is rated 4.5 out of 5 by 2176.
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  • MSRP: 59.99

Save 15% + free shipping with Water for Life $50.99

Questions? We can help

  • 866-662-6885
  • SAT: 9AM–5PM CST

Pure Performance

Claryum® Technology

Activated Carbon Reduces organic chemicals like herbicides, pesticides, VOCs and MTBE.

Catalytic Carbon Targets chlorine and chloramines.

Ion-Exchange Filters heavy metals like lead and mercury.

Absolute Sub-Micron Mechanical Filtration Captures asbestos and chlorine resistant cysts like cryptosporidium and giardia.

The result: 10x more contaminants reduced plus healthy minerals retained for purely delicious filtered water.

Pure Performance

Also Replaces

AQ-4500, AQ-4501

AQ-4600, AQ-4601

Pure Performance

Convenience & Value

Fewer filter replacements. More clean, great-tasting water.

One Aquasana Claryum® filter gives you 11x the capacity of the leading gravity-based pitcher at only 11¢ per gallon with Water for Life.

How It Works

Superior Systems

Selective Claryum® Filtration

Reduces 77 contaminants while retaining beneficial minerals for optimal hydration.

Easy to install, replace & maintain

No permanent fixtures or installation required.

certified by NSF

NSF Certified

Full system tested and certified to NSF/ANSI Standards 42, 53, 401 + P473.

For a complete list of contaminants reduced see our Performance Data Sheet.

  • 450 gallons
  • 6 month filter life
  • 1 year warranty
  • 90 day guarantee

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Read the Reviews

Rated 5 out of 5 by from This filter set filter water great I stopped trying to replace the filters and I buy a new system every six months. It's actually cheaper right now by 2 bucks for the filter system. After the first filter change if you can get the covers off, they will leak or the tabs will break off or the socket stud will strip and be unusable or you can't get the hose disconnected to use the socket stud, been through it all. I have never had success changing filters so for me this is the best option. Aquisana told me if I joined water for life then I would get replacement parts for free. So if something breaks on a filter change I have to call them and then weight a week for the part. No thanks, I did that one time and my wife was not happy we had no filtered water to drink. As for filtration, it's great. I love this filter for that. Makes the water taste great removes a lot of contaminants as advertised and removes odor. That's why I stayed with the Aquasana countertop filter.
Date published: 2019-08-31
Rated 5 out of 5 by from Great product! Easy process changing the filters. My only problem was the o-rings falling out and me not noticing. Once I reinstalled them everything was fine.
Date published: 2019-06-02
Rated 5 out of 5 by from Absolutely way above my expectations Installation simple, Tasted water after running water for 10 minutes water never tasted better. Tasted exactly the way I wanted. No foul taste or smell. Searched online till I found this AQ4000. Compared it to practicly all other countertop water filters and decided on the AQ4000 because it appeared to be the best filter and the best buy. Very happy I purchased it, it works Fantastically.
Date published: 2019-03-05
Rated 5 out of 5 by from easy to use instructions and packaging real nice/ Glad to have great tasting water in the home again
Date published: 2018-04-20
Rated 5 out of 5 by from Installation is a breeze! I had my new water filter for about 6 months now. No leaks and no problems. This filter looks so sleek and pretty on my counter top. I had used Aquasana for years when i lived in Pa., now I moved to Fla, which is much needed here in Fla. What a great company, I had so many universal facet adapters that came with my unit. Thank you so much for making my life so easy!! Sonja
Date published: 2018-04-19
Rated 5 out of 5 by from Great tasting water I bought this unit a month ago and am very happy with how it works. The water tastes great. This unit is easy to install and I strongly recommend it.
Date published: 2018-04-13
Rated 5 out of 5 by from Great taste I have used this product for a lot of years and we enjoy the benefit of clean, great tasting water
Date published: 2018-04-09
Rated 5 out of 5 by from Peace of mind I installed the AQ-4035 system a few years ago. The filters are easy to install and I notice the difference in the
Date published: 2018-04-03
Rated 5 out of 5 by from Great Filter This filter has been what I have been looking for.
Date published: 2018-04-02
Rated 5 out of 5 by from happy with appliance In use several years best water at least overall cost
Date published: 2018-03-27
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Aquasana FAQs

  1. Do I have to pay for a plumber to install the system?

    Our countertop drinking water filter system is very easy to install, and it only takes a few minutes to do; 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. How often do I have to replace the cartridges and how much do they cost?

    We recommend replacing the cartridges after six months or 450 gallons, whichever comes first. Replacement filters cost $59.99, but you can save 15%, get free shipping, and extend your product warranty by signing up for our no-contract auto-ship filter replacement program, Water for Life.

  3. Is this purified water?

    No, and actually, purified water is not as healthy as filtered water. Purified water undergoes reverse osmosis or distillation, which strip everything out of your water - not only the contaminants, but also the healthy, natural minerals. Our system uses selective filtration designed to reduce contaminants from the water and leave in the natural healthy minerals like calcium, potassium, and magnesium.

  4. How do I recycle the replacement filters?

    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. To recycle the AQ-4035 drinking filters yourself, remove the ends of the filters, recycle the plastic parts (which are appropriately numbered) and put the carbon either in your compost pile or garden (carbon is good for plant life), or just throw it out (since the carbon degrades quickly, and is a positive component in a landfill).

  5. I'm a renter, so I can't drill or modify the plumbing. Which filter system should I get?

    The countertop system is perfect for renters because it does not require a new hole in the counter. To install an under counter system, you can remove the existing sprayer or soap dispenser in your rental and install our faucet in its place. This option will not damage or permanently modify your plumbing. When you move out, you can easily remove the system and reconnect your plumbing back to normal.

  6. What size adapters do you send with the countertop system (for the diverter hose)?

    13/16 and 15/16 male.

  7. What size is the chrome collar on the countertop system (on the diverter hose)?

    55/64-27 female.

  8. What does TDS mean?

    TDS is the acronym for Total Dissolved Solids, the amount of dissolved minerals and metals present in water. TDS meters tell you the concentration of dissolved minerals and metals, but are not an accurate measurement for contamination. Aquasana products reduce and remove harmful TDS like lead, but selectively retain or replace healthy dissolved solids like calcium, magnesium, and potassium.

  9. What is BPA? And why are people concerned about it?

    BPA stands for Bisphenol-A, a contaminant found in most plastics. BPA can adversely affect your health if consumed at high levels. Aquasana drinking systems do not contain BPA, and our filtration process reduces existing BPA.

  10. Does having hard water mean it is contaminated?

    Hard water is more of a nuisance than a health risk, and is not necessarily contaminated. Most water sources in the USA are considered hard. Hard water is generally safe to drink, after it has been properly treated.

  11. What is soft water, and is it safe to drink?

    Having soft water just means you have a lower concentration of dissolved minerals in the water (primarily calcium and magnesium). Soft water does not mean clean water. Your water can be soft and still contain contaminants.

  12. What is selective filtration, and how do Aquasana systems filter drinking water?

    Selective filtration is the process of sub-micron filtration, micron filtration, adsorption and ion exchange, all of which selectively reduces chemicals, heavy particulates and most dangerous heavy metals from the water while maintaining healthy minerals like calcium, magnesium and potassium.

  13. How do I know if an Aquasana system will be compatible with my faucet?

    The only faucets the AQ-4000 water filtration system will not be compatible with are the 2-in-1 faucets that have a detachable sprayer at the faucet opening. The AQ-4000 will fit most standard faucets and also comes with two adapters. If your faucet happens to be a non-standard size than the hose connection or adapters that come with unit, you can take your aerator to the plumbing section at your local hardware store and have it measured. After you know the size of your aerator, contact technical support with the size and we will see if we carry the right size adapter, and we will send it to you.

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User Q & A

I purchased an Aquasana countertop water filtration system from Costco.  What replacement cartridge works for this unit?

Asked by: Cutty
If the picture shown (blue & white cartridges) is what was in the system when you got it, the replacements is: 100236133 AQ-4035 Drinking Water Replacements
Answered by: Dodie's Mom
Date published: 2018-12-26

Do I need to purchase an O-ring for the whole house filters?

Asked by: Pandaperson
Aiken, The o-rings will not be required to switch out every time the filters are replaced. However, if the o-rings start to loosen up due to wear and tear, we will be glad to send replacements. Kindly contact our service team at 866.662.6885 for pricing. Thank you, Aquasana
Answered by: Aquasana Service Team
Date published: 2018-11-06

Can you use the counter top filter for hard water without any other water treatment system? And do you ship to Europe?

Asked by: Rachie
Can be used for hard water without any other water treatment.  I don't know if they ship to Europe as I live in Texas.
Answered by: Dodie's Mom
Date published: 2018-12-26

What is the ph of water filtered with the AQ 4035 filter?

Asked by: Virginia wants to know
Because everyone's water is different when it comes to the pH in water, it is not determinable. The system is designed to remove contaminants in the water, not change the pH.
Answered by: Aquasana Service Team
Date published: 2018-12-26

Does this filter remove fluoride?

Asked by: Jeanne P
Fluoride removal requires special filtration through a membrane. Our Reverse Osmosis system is NSF certified to remove over 95% of fluoride in your drinking water, as well as 87 other contaminants. For more information, please visit: 
Answered by: Aquasana Service Team
Date published: 2019-08-04

How should I dispose used Aquasana Shower filter?

Asked by: Bala
Dispose of used filters in home recycle bin supplied by city.
Answered by: Dodie's Mom
Date published: 2018-07-04

Do you have a replacement housing for the under counter AQ 4000 system? One of the prongs has broken on my system. I have replacement cartridges but need the housing.

Asked by: maggie
No I don’t have a replacement housing.
Answered by: Marty 456
Date published: 2018-06-08

Hi there. For some reasom after install, when we us 53 the watrr filter faucry, it continues to release water for maybe 10 seconds after we turn the tap off. Is there something else we need to do?

Asked by: JackSuss
Please contact Aquasana customer service at 866.662.6885 to discuss your warranty options. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2018-05-10

How can I replace the hose? I don't see any option on the website, under my account.

Asked by: Mariel
I believe the unit has a 100% warranty if you have water for life. Call customer support and ask for a replacement hose.
Answered by: Wolff
Date published: 2018-05-09

Am using the two stage undercounter filter model AQ-4000.25. Does it filter microplastics and to what size?

Asked by: anne1
Microplastics are small plastic particles in the environment. While there is some contention over their size, the U.S. National Oceanic & Atmospheric Administration classifies microplastics as less than 5 mm in diameter. They can come from a variety of sources, including cosmetics, clothing, and industrial processes. 5mm = 5000 microns. Aquasana drinking filters are certified by the NSF to remove contaminants down to 0.5 microns, and the Reverse Osmosis system reduces to .001 microns. However, while our filters remove many of the known contaminants that make up various microplastics, our systems have not been certified specifically for the term “microplastics.” Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2018-11-22

I need to replace the under-counter filters for the Aquasana AQ-4000 filter system that I got in 2006. Which is the right replacement filter. Mine is an Under counter system with a counter-top spout. Thanks.

Asked by: Ebyam
These are the correct filters for the AQ-4000 system with the under-counter conversion kit. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2018-04-05

Do these filters fit the AQ4601? Are they the same for the two filter system?

Asked by: Roseanna2359
Hi Roseanna, Yes, if you have the AQ-4601 system, then these are the correct replacement cartridges for your system. Thank you, Aquasana
Answered by: Aquasana Customer Support
Date published: 2018-01-17

hi i need a filter reeplacement for my machine model AQ-PWFS-RB3,  can you tell me what filter i have to buy? thank so much

Asked by: Monica
Hi Monica - You can visit this link here to purchase replacement filters for your Clean Water Machine (also work for your version called the Powered Water Filtration System): Please let us know if you have any additional questions!
Answered by: Aquasana Customer Support
Date published: 2018-01-11

Is this the correct filter for the powered water filtration system which has an inner pre-filtered water container inside of the post-filtered water pitcher?

Asked by: Jujufru
Answered by: Gracas1
Date published: 2017-12-18

Are the replacement filters (AQ-4035) available in Canada?

Asked by: Jenn
Hello! We are happy to ship all of our products to Canada. If you enroll in our Water For Life program, we will even cover all taxes and duties on automatic orders for replacement filters! - Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2017-10-12

I've been using AQ4035 filters. I'm looking for a list of contaminants it filters, and what percentage; specifically--Bromodichloromethane, Chloroform, Chromium, Dichloroacetic acid, Trichloroacetic acid, Totaltrihalomethanes, Nitrate, Nitrite, Chlorate

Asked by: James115
Hi James, I hope you have been enjoying your system! A full list of contaminants as well as the percentage which is removed can be found here- Let us know if we can be of further assistance. Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2017-08-18

My AQ 4600 system leaks where the filter caps screw on. Is there parts available or an update? The rest of the system works perfectly!

Asked by: Peterf2
Hello, I'm sorry to hear that your system has sprung a leak! Please contact us at 866.662.6885 and a member of our service team will be happy to discuss your warranty and upgrade options. We look forward to hearing from you! Thank you, Aquasana Customer Support
Answered by: Aquasana Customer Support
Date published: 2017-07-30

I would like to replace the hoses as well as the filters for tabletop system. Is that possible?

Asked by: Jo Ann

Are the filters recyclable?

Asked by: Aubrie

Hello, Looking for replacements filters for AQ 4000W Are the AQ 4035 the same filter?

Asked by: Dennis T

The aq-4035 water filter is safe for a nephropathy man?

Asked by: George1972

The filters says to use AQ-4025 replacement filters. Is there a replacement for this filter

Asked by: Dan L

How can I get new o rings?

Asked by: Melodypen

Do you still carry the AQ-4025 filters?

Asked by: HAGU

Does this filtration system remove nitrates? We have a house we purchased in a rural area and the water is high in nitrates.

Asked by: Meggie

I own the clean water machine; you auto ship filters. Light goes red after about 6 months. What makes it go red? How does it know when full? I never use 360 gallons in 6 months (2 gallons/day). Why does it go red before? Is the light on a 6 month timer? 

Asked by: Hilda

We need AQ-4025 replacement filter. Please contact me to let us know which replacement filter to purchase. Thank you!

Asked by: MPVS
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