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 1071.
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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.

How It Works

Superior Systems

Selective Claryum® Filtration

Reduces 68 contaminants while retaining beneficial minerals for optimal hydration.

Easy to install, replace & maintain

No permanent fixtures or installation required.

NSF Certified

Full system certified to NSF/ANSI Standards 42, 53 & 401.

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 Best Tasting water This filtration system is the best for taste, quality , high volume. The replacement service is convenient and when my system was aging , I was surprised to find out that Aquasana replaces them at no charge. I now have a beautiful black unit with transparent tubing and a lovely , updated facet dispenser. Couldn't be more pleased. The current filters are even better , getting out the hard to filter pharmaceuticals and petrochemicals as well as . I live in a tropical area, with an old water pipe system. With plastic water bottles being toxic it's essential to have , just dispensed water which I put in glass bottles to go. Brook
Date published: 2016-08-09
Rated 4 out of 5 by from Been using for years I've used this product for 5+ years. It's cost effective, produces less waste, and seems to improve the taste of our tap water. There are some drawbacks: funny taste after changing the filters, difficulty removing the cover when changing filters, and the location of the tubing. I've lived in several places and have never been able to find a good place for this filter to sit near the sink. They should add longer tubing, or add an option to route the tubing in another direction. The customer service has always been excellent and I've never had any components of this filter break on me.
Date published: 2017-01-10
Rated 5 out of 5 by from The only brand I trust The only brand I trust. I did a lot of research on water filtration systems and Aquasana is always at the top of the list. I have recommended this brand to my brothers, sisters, mother, and aunt who are all loyal customers now. Unfortunately, I referred them long before the referral program. I love the smaller glass bottles Aquasana came out with too. I fill them with water each morning and take it with me wherever I go. They fit perfectly in my purse. I must say that even my dogs are happy with the taste of the water! Before when I had the Pur filter, I had to buy my dogs bottled water because they refused to drink the water from it. Remember, dogs have a keen sense of smell that is much better than ours.
Date published: 2017-03-25
Rated 5 out of 5 by from Excellent value for better health We live in an agricultural area, and the use of so many chemicals by farmers means that a lot of horrible things end up in our water supply. Aquasana filters remove many of the most dangerous compounds. This makes a real difference when you are drinking the water everyday. The Individual filter cartridges can be a little difficult to install or remove, but it is not overwhelming. Opening the screw-top holes for inserting the cartridges is the hardest part. I recommend using a socket wrench, but be sure you use the right size, as the plastic head can be damaged easily.
Date published: 2017-01-10
Rated 3 out of 5 by from Challenging to replace filters Although I like the AQ-4000 overall, replacing the cartridge is very difficult. Specifically, when pulling out the hoses, you're instructed to hold down this very small grey plastic collar that can't be more than 2 mm wide, while with your other hand you're supposed to pull out the hoses with the elbow plastic connectors. You can't use a simple pair of pliers to remove the connectors for fear of breaking them (they're plastic), and they stick in way that doesn't allow easy removal. I would much prefer a metal connector for the hoses with a locking collar to secure it.
Date published: 2016-11-12
Rated 5 out of 5 by from The difference is startling! Whoever said New York City has the cleanest drinking water failed to notice that those tests are done before it goes through the old gross pipes in my prewar rent stabilized hovel. I'm on the water-for-life program because without this filter the water in my apartment tastes almost non potable. The amount of dirt in the filter I replace every 6 months is jarring and buying bottled water isn't an option for myriad reasons. After a good deal of research a very long time ago Aquasana is the best bang for your filtering buck and I sing their praises to everyone I know.
Date published: 2017-01-19
Rated 5 out of 5 by from clean, safe, assurance at the tap. I installed the Aquasana filter to assure that my drinking and cooking water is filtered and free from pollutants. The supply is drawn from a deep, underground aquifer that is generally pure and free from groundwater runoff. From there it is pumped to the house and does go through copper pipes that have been soldered. With the addition of a duel organic-inorganic Aquasana filter at the delivery point I feel confident that the purity of the water is assured . The filter was easy enough to install, with all parts necessary for installation provided by Aquasana.
Date published: 2017-01-10
Rated 4 out of 5 by from long time user I found Aquasana at least 5-6 years ago from online reviews and gave it a try. The counter top unit was easy to set up and use. I'm on the periodic shipping plan and have only had to replace the unit itself once, which Aquasana replaced for free since I'm under the program. I really can't tell any difference in the taste of water. I feel better that it is running through the filter and that Aquasana purports to remove toxins and chemicals. I haven't independently verified the claims but I believe that the company is trustworthy. I used to get regular water delivery and that is very expensive. I believe the drinking water in my area is safe and tastes fine, so the filter just adds an extra level of security for me and my family
Date published: 2017-01-17
Rated 4 out of 5 by from It Works For Me Another pro is that the bulky part of the unit does not have to be affixed to the faucet itself. When I moved in to my apt., the maintenance guy told me purifiers that do can damage the faucet and tenants are charged for it out of their deposit... The slow pour of the unit is pain. When the weather gets hot, my "cold" water gets warm-hot and it makes it hard for me to use the filter because hot water is not good for the unit. I wind up filling water bottles in the morning and water to cook with but it takes a while with slow pour.
Date published: 2017-06-11
Rated 5 out of 5 by from 5 Minute Replacement I move house frequently, including overseas, so I'm never quite sure what water quality I'm going to get out of the tap. The Aquasana counter-top filter is quick to attach and remove, easily portable and ensures me that no matter where I go, I'll have good tasting clean water to drink. Given the number of adaptors that come included with the product, I haven't yet found a faucet that I couldn't attach to. When it comes time to replace the filters, 5 minutes of effort is all that's required -- its a very good design!
Date published: 2017-03-14
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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

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

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

Asked by: Jenn

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
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