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

Learn More

Read the Reviews

Rated 5 out of 5 by from Love This Filer System! I have tried many brands of water filter and was never happy with the performance of any water filter system until I purchased the counter-top system from Aquasana. I must admit that I was skeptical but hopeful about trying Aquasana. I could not be happier! I love this filtered water system and will never have another brand.
Date published: 2018-03-16
Rated 5 out of 5 by from We like these filters We use the counter and undercounter plus the shower filter system. We are happy.
Date published: 2018-02-28
Rated 5 out of 5 by from Easy replacement! I purchased the Aquasauna countertop filter a few years ago and a new filter and thought the filters lasted a year, went online to reorder the filters on a free shipment if I renewed for the every 6 month replacement filters.... I did that so I won't have to think to reorder the filters, it just makes my life easier!
Date published: 2018-02-22
Rated 5 out of 5 by from Very happy with the purchase Very easy to install. Water taste great, no chlorine taste or odor. I don’t have to buy bottled water.
Date published: 2018-02-15
Rated 5 out of 5 by from I love Aquasana I have used the undercounted and shower models for years. Love them and the water they clean!
Date published: 2018-02-14
Rated 5 out of 5 by from Performance This is my third or forth replacement filter and from the start a couple of year ago. They all perform excellent. My general health have improve and I'm getting out more.
Date published: 2018-02-11
Rated 5 out of 5 by from Great tasting water! My family has been using these water filters for a year and a half. We purchase a replacement every 3-6 months depending ion how quickly they become filled with particles. Without these filters, our small municipal water source delivers water that is not always clear. Although the tests show that it is safe, the water tastes bad without this filter. I am very pleased with this product!
Date published: 2017-12-13
Rated 5 out of 5 by from Great product and great service I've had my filtration system for years but stopped using it when I moved to a new house with a kitchen faucet that was incompatible with the system. In the meantime, I was buying spring water from the store but it was getting expensive. So I contacted Aquasana to see about adapters to use so that I could use the system again. They were kind enough to send out a set of adapters-I just paid for shipping and handling. Great service and great products!
Date published: 2017-11-29
Rated 5 out of 5 by from Great portable product with great pricing I've been using Aquasana counter top filters for several years now. I am very happy with them. I will be purchasing either a whole house filter or at least a shower filter in the future
Date published: 2017-11-21
Rated 5 out of 5 by from Easy to change Gets rid of many contaminants. The improved taste is a great aspect.
Date published: 2017-11-20
Rated 5 out of 5 by from Aquasana water filters I bought Water For Life Aquasana water filter system over ten years ago, and have never been disappointed with the filters.
Date published: 2017-11-19
Rated 5 out of 5 by from Aquasana AQ4035 Drinking water replacements Easy to install. Great tasting water. Great service.
Date published: 2017-11-13
Rated 5 out of 5 by from Quick and easy The filter replacements are easy to replace and only take a bit of time. The water tastes great with no carbon taste.
Date published: 2017-11-09
Rated 5 out of 5 by from Excellent Products Excellent products, which we have been using for years. More than 15 years, at least. Can't recall exactly when we got rid of our other pitcher/container filters and bottled waters. This filter removes a higher percentage of water contaminants. Best investment you can make while eliminating the need to cart heavy bottled water containers from the supermarket.
Date published: 2017-10-22
Rated 5 out of 5 by from Wish we could have used it. After purchasing this we found out we couldn't use it. We bought a used home and for some reason my husband couldn't get it open to put the new filters in. I was really looking forward to clean water.
Date published: 2017-10-22
Rated 5 out of 5 by from One of the best decisions I've made! I purchased the Aquasana counter top water filtration system a few years ago and the unit came with four glass bottles at the time. We have been extremely happy with the unit and are currently in the Water for Life program which automatically ships the replacement filters every six months and this company really stands behind their products. The taste and quality of the water is exceptional and my family is very happy. We rarely purchase bottled water now but only because we don't like to take the glass bottles outside. This unit is a good choice for your home water!
Date published: 2017-10-08
Rated 5 out of 5 by from Superconvenient We love the convenience of pure drinking water at our kitchen sink. What is even more convenient is not having to remember every six months to order a filter, they just send it! Thanks, Aquasana. (Not to mention the reduced price.:))
Date published: 2017-10-03
Rated 5 out of 5 by from Excellent product The water tastes great - better than bottled water. When I told you that the outgoing hose was brown, you sent me a pre-filter, and now the water tastes better than ever. Thank you.
Date published: 2017-10-03
Rated 5 out of 5 by from Easy to use I've used Aquasana for years and have no complaints! One housing did crack after the water still in the filter froze... but Aquasana sent me a replacement. Thanks!
Date published: 2017-10-02
Rated 5 out of 5 by from best water purchase ever !! I bought my countertop system about 10 years autoship for filters, never a problem. Got a cracked in casing, free replacement. .no hassles whatsoever.. Whenever I call to update card, info..etc..I am quickly routed to a REAL person. ..! AAAA + customer service...Great tasting water. Never want to be without it.
Date published: 2017-09-30
Rated 5 out of 5 by from Good! I've been using aquasuana for years. Always been satisfied with their products and how it handles my water. I will say I had a hard time taking the covers off of my counter housing unit by hand. But with a ratchet wrench they come off in a breeze now. Getting the tube in and out can be a little tricky but I don't mind.
Date published: 2017-09-30
Rated 5 out of 5 by from Great service Been using it for a few years now and very happy with it, but the customer service is awesome
Date published: 2017-09-29
Rated 5 out of 5 by from Cost Filters are OK, but TOO EXPENSIVE. Make less expensive and I have 4 neighbors in our Condo who will buy it.
Date published: 2017-09-29
Rated 5 out of 5 by from Excellent Drinking Water Filters Have been using these now for about 4 yrs with auto delivery of replacement filters every 6 months. Am well pleased with how this system works.
Date published: 2017-09-29
Rated 5 out of 5 by from Love this I would never drink tap water no matter what is said about it. So much more economical and healthier than bottled water
Date published: 2017-09-29
Rated 5 out of 5 by from The taste is what counts! I thought you would want to know. My new acupuncturist, who is also new to my city, insisted I drink nothing but “purified” water which he provides is a dispenser from a local company. I told him I would, called the company to inquire about their costs, equipment, etc. Before ordering, however, I told both the acupunturist and the “purified” water provider that I would have to taste their water as I have this built-in quality checker. Their water did not pass my taste test and I realized that if they do any testing, they do not publish results. Told the acupuncture guy (who is no longer my acupuncturist) that anybody can say “purified” water, but that I recommend Aquasana to all of my friends because their water is truly the purest - as evidenced by my personal taste test! Thank you for providing my and my family with healthy water. We are all healthy and grateful to Aquasana! Lei Ho
Date published: 2017-09-28
Rated 5 out of 5 by from Aquasana drinking water review After using Aquasana five years for drinking water I have not taken one drink of tap water. This will blow you away. Our three year old Golden Retriever will pass taking a drink of fresh water from out side tap till she can get to her bowl of fresh Aquasana water which we keep renewed for her several times a day.. True account, the dog can tell the difference. Dwight Reid
Date published: 2017-09-28
Rated 5 out of 5 by from Amazing product! I love the quality of the water these filters create!
Date published: 2017-09-28
Rated 5 out of 5 by from Love it! I have been using for years. So easy and puts my mind at rest that water is good.
Date published: 2017-09-28
Rated 5 out of 5 by from filters great product!! have had his for years very dependable !
Date published: 2017-09-28
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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.

Learn More

User Q & A

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: 2019-12-17

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: 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
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