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 2200.
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  • MSRP: 59.99

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

Questions? We can help

  • 866-662-6885
  • MON–FRI: 8AM–7PM CST
  • 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 AQ-4035 Filters Perfect as Usual Filters arrived on time. Product works as specified. Have had these products cycled ecverty 4 months for many years. Always pleased.
Date published: 2020-11-20
Rated 5 out of 5 by from Aquasana product rating The filter was easy to install, and I no longer taste the horrible chlorine in the water.
Date published: 2020-10-28
Rated 5 out of 5 by from Good product Water tastes good. Peace of mind contaminants are gone. Easy to install and maintain.
Date published: 2020-10-15
Rated 5 out of 5 by from A lifesaver! Very happy I bought this system. The water in my town smells and tastes atrocious (scary).
Date published: 2020-10-15
Rated 5 out of 5 by from Excellent product as well as superior water taste. This water filter is used daily and we keep up with the recommended filter changes. We have had great tasting water since adding this to our shop.
Date published: 2020-10-15
Rated 5 out of 5 by from Great quality! Easy to replace and the auto replacement program makes it a snap. So nice to have the filters for life program. Free shipping and automatic!
Date published: 2020-10-09
Rated 5 out of 5 by from Great water filter for water cleaner Easy replace. Good price too. Local water system need Aquasana water filter! It is a must!
Date published: 2020-10-08
Rated 5 out of 5 by from PERFECT... The filter was easy to install. The water is amazing. Before I didn't drink too much water. Now I drink way more. I am very happy. I might not be drinking as much as suggested, but I am very close. It seems that I really enjoy water now. I drink it far more than any other sugary drinks. I am glad. Water does so much good to our body. We have to make an effort. It also saves a ton of money. Bottled water is so expensive. Here in the city of Chicago, you even have a tax water. The bottled water does not taste the same either. I don't want years of accumulation of microscopic plastics going into my body either. I am super happy with this filter. I had another brand before years ago. I am very happy with this filter. I highly recommend it. I have the counter top.
Date published: 2020-10-07
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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 have the filters4035 and I need a rubber ring for the white one do u carry that,it leek on that side 

Asked by: Lily the water girl
Hello, Yes, we can provide the replacement parts needed. Kindly email us directly at support@aquasana.com or contact us directly at 866-662-6885, Monday thru Friday from 8am-5pm CST. Thank you, Aquasana Customer Support
Answered by: Aquasana S
Date published: 2020-10-21

I have AO-US-200 2-stage filter system, what filter do I buy?

Asked by: Ljoe
Hello, Thank you for contacting us. I have provided a link down below for the filters for the Aq-5200 . https://www.aquasana.com/replacement-drinking-water-filters/under-counter-2-stage-filters If you have any further questions feel free to contact us. Thank you, Aquasana Customer Support
Answered by: Aquasana S
Date published: 2020-06-11

What is the red light indicator measuring? An amount of time, volume of water filtered or how clogged is the filter?

Asked by: J and J
Hello, Thank you for your question. The red light indicates it is time to change out your filter. If you need further assistance contact us at 866-662-6885. Thank you, Aquasana Support
Answered by: Aquasana S
Date published: 2020-04-09

Is there an indicator on my Aquasana sinktop unit that will let me know when to change the filters? Or do I simply replace them after 6 months? Or how do I determine when is the correct time to replace them? Thanks!

Asked by: drgphx
You have to keep track yourself. My husband puts a sticker on with the date.
Answered by: spicejar
Date published: 2020-03-08

We purchased AQ-4035 REPLACEMENT filters on 09 Jan, 2019 , 20 Aug, 2019 and 21 Oct, 2019. The last replacement was 3 months and the filters were darker colour - is this normal? and is the 3 months normal?

Asked by: Raymond123
I think it would depend on how many people / much water is being passed through the filters and the type of water used by your city.
Answered by: Dodie's Mom
Date published: 2019-11-25

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: 2020-07-15
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