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 CDT

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

Does the well water filter system remove arsenic?

Asked by: Stacy C
Hello, With our Reverse Osmosis unit, the ion exchange process will remove heavy metals like lead and mercury from the water using Claryum technology along with the Remineralizer. Arsenic will be removed by the Membrane. Although reverse osmosis systems on the market have been shown to remove uranium in the past, the NSF does not offer a uranium certification for the Aquasana Reverse Osmosis system. Thank you, Aquasana Support
Answered by: Aquasana S
Date published: 2019-09-21

I need to replace my faucet part of my under counter system due to constant dripping. How do I go about that without ordering a whole new system?

Asked by: Dripping Faucet
Hello, Please contact us at 866-662-6885, to discuss a potential solution for your home. Thank you, Aquasana Support
Answered by: Aquasana S
Date published: 2019-09-21

My Aquasana says to replace filters only with 4025 and you only have filters 4035. Are the filters 4035 compatible with 4025?

Asked by: MTTM
Hello, Thank you for your question. Yes the 4025 filter is compatible with the 4035 filters. If you have any further questions contact us at 866-662-6885. Thank you, -Aquasana Support
Answered by: Aquasana S
Date published: 2019-07-18

We just replaced our filters & the water leaks out of the bottom of the white filter.  It was working great before we put the new filters in.  There is no water leaking out of the blue filter side, just the white side.  

Asked by: Tricia’s water filter
Make sure you only purchase filters from Aquasana. I ordered one on Ebay that was suppose to work. It looked almost the same but the open end was just a bit different. Couldn't get my money back either. And it stuck in the housing and I had a hard time getting it out. Anyway, if you did order it from the company, I really don't know. The one I got made mine leak and that was my experience. I think sometimes those "new" filters are older ones and maybe Aquasana made them a touch different on newer models. Mine is about 5 years old. Good Luck. I love mine and never had a problem with it until I bought that other filter.
Answered by: Carrotsoup
Date published: 2019-03-28

how often should the filters be replaced in the 4501?

Asked by: richy v
It depends on how much water is filtered per month.  I am one person and I change every 3 or 4 months.
Answered by: Dodie's Mom
Date published: 2019-03-13

I received the countertop unit and also the prefilters I ordered thinking the hose that comes with it was able to accommodate them. Not the case. Could you tell me how to order / obtain the countertop tube that does accommodate them ? Thank You, Mark

Asked by: Mark Cramer
My unit still has original hoses and I order the regular replacement filters.  They work fine; never had a problem.  
Answered by: Dodie's Mom
Date published: 2019-01-15

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
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