Drinking Water Filter
Countertop Water Filter

Instantly transforms tap water into healthy, great-tasting water with no installation or permanent fixtures.

CWM water filter

Want more versatility? Our Clean Water Machine comes with a portable pitcher or countertop dispenser. Shop Now

Countertop Water Filter - White is rated 4.5 out of 5 by 901.
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50% OFF COUNTERTOP WATER FILTERS - limited time!
  • MSRP: 114.27
  • Sale: 57.13

Save 50% + free shipping with Water for Life $57.13

Questions? We can help

  • 866-662-6885
  • MON–FRI: 8AM–6PM CST
  • SAT–SUN: 9AM–5PM CST

Whole Health

Ultimate Purity*

Instantly transform ordinary tap water into clean, extraordinary water.

NSF Certified Claryum® filtration technology independently tested and proven to remove over 97% of chlorine and chloramines. Also reduces:

  • Heavy metals like lead and mercury
  • Chlorine resistant cysts like giardia and cryptosporidium
  • Organic chemicals like herbicides, pesticides and VOCs
  • Pharmaceuticals like estrone and ibuprofen

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

Aquasana filters 10 times more contaminants

Whole Health

Ultra Delicious

Claryum®'s selective filtration technology retains naturally occurring beneficial minerals in your water like Calcium, Potassium and Magnesium for healthier, more delicious water!

Whole Health

Eco Friendly

Designed with the environment in mind! Intelligent system design reduces plastic waste by minimizing disposable plastic parts.

Pure Performance

Claryum® Technology

Activated Carbon Reduces pharmaceuticals, 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 than the leading pitcher plus healthy minerals retained for purely delicious filtered water.

Pure Performance

Easily Attaches

No permanent fixtures or installation required. Simply screw on the faucet attachment for filtered water right from your tap! No more big, bulky filters cluttering up your sink space.

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 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 the claims specified on the Performance Data Sheet.

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

Help & Support

Video Help

  • How to install the countertop faucet water filter
  • How to replace the AQ-4000-R countertop filters

Installing the countertop faucet system

Replacing the filters in the AQ-4000

Learn More

Read the Reviews

Rated 5 out of 5 by from Cuoldn't be happier The water from Aquasana filter is amazing. I feel more alert, with better cognition since drinking water filtered by Aquasana. Filtered water from the store or from a water store has nothing on this filter. The fact that it also takes out ammonia is amazing. I was also very appreciative of the customer service rep I dealt with, Joel H., who was super honest, and gave me a two for one promotion without me ever having to be hesitant about purchasing in the first place. He knew I was going to buy, and I was just deciding which filter to purchase for my countertop, whether to go with the electric one or the one I am leaving a review for, and then I was going to purchase a shower filter as well. He still told me about the two for one promotion that I would not have been able to learn about online or anywhere else. I really appreciated his honesty, when he clearly could have gotten a higher sale. Super honest employees! The filter is super easy to install, just use pliers to get the tip off of your spout. I did not end up needing the extensions that came with the product, but if you do, they are already included. Overall, I am extremely satisfied with the product, its installation, and the customer service. Also, I read some reviews about slow water flow, and I have found my experience to be pretty good with that. I can fill up a a 12 cup pitcher in 51 seconds (yes, I timed it :)
Date published: 2018-02-20
Rated 5 out of 5 by from Love it so far This filter installed without any issue, and has been working perfectly since, for over a month.
Date published: 2018-02-19
Rated 5 out of 5 by from Outstanding Been about a month now and is well! Product is clear, concise and to the point.
Date published: 2018-02-19
Rated 5 out of 5 by from Best water purifier This Aquasana is so easy to set up. We have very hard water and with the Aquasana we now have the best tasting water. I very highly recommend Aquasana.
Date published: 2018-02-17
Rated 5 out of 5 by from Great Counter Top Filter I have bought a number of these in the 10 plus years I have been using them. They work great and simple to install, my only problems have been with the divert-er. The water flow is a bit slow once the filter starts collecting junk, but all in all I am very happy and just hope it is taking out all that it says it does.
Date published: 2018-02-16
Rated 5 out of 5 by from Nice Device This countertop filter is convenient and efficient. It is less trouble than the previous Britia filter system, as I don't have to fill pitchers. It provides very good tasting water at all times.
Date published: 2018-02-16
Rated 5 out of 5 by from SUPER SWEET. SUPER DEAL. SUPER PRODUCT. Recently purchased the Aquasana model # AQ-4000W Counter Top Water Filter System. Took advantage of a BOGO offer from Aquasana and also signed up for the Water For Life Program which automatically ships new replacement filters to me every 6 months at a discounted rate with free shipping. Just doesn't get any better than that. Even a novice DIY'er can hook this filter up in 5 minutes. Keep in mind this is not an entry level filter. This POINT OF USE system has 2 high performance filter cartridges inside it and sells at a very affordable price. I have been using the filter for several weeks now and it has performed flawlessly. I am also investing in some Water Bottles from Aquasana so I can bottle my own water instead of buying it at the convenience store. KaChing! KaChing! Need I say more? This is a great company doing a great business and providing a great service to its customers. Very happy with this purchase. Thank you Aquasana.
Date published: 2018-02-16
Rated 5 out of 5 by from Great taste I love my sink filter. Does a great job. I only wish the hose was about a foot longer. This would help when Moving to other side of sink.
Date published: 2018-02-14
Rated 5 out of 5 by from Great product I bought last December. It’s easy to install and great product.
Date published: 2018-02-14
Rated 5 out of 5 by from Easy to use Very easy to install and very easy to use. Thanks.
Date published: 2018-02-13
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Learn More

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

I have the countertop filtration system and wanted to know if the water diffuser end of the pure water can unscrew for cleaning. Dirt has apparently gotten into that part of the pure water end and is causing a problem.

Asked by: junior44
I have the same countertop filtration system but have no idea what you are referring to when you say "diffuser end" -- unless you might mean the part that attaches to the faucet itself -- where the water comes out. If some kind of dirt has gotten in there, I would say, yes, clean it out. Are you sure it is dirt? Could it be mold? If so You may want to bleach it, too. Do not get bleach on the actual filters, but the housing unit and the faucet attachment should not be harmed by a quick bleach bath. Rinse thoroughly before re-assembling. Be careful to not touch the filters with unclean hands, or bleach, if you are going to reuse the same ones. If it is time to put in new filters, then take the old ones out, clean and bleach the unit. Rinse very well and then replace the filters. You should be able to clean any part that you normally can assemble, or take apart, on the unit. Hope that helps.
Answered by: Retired in Georgia
Date published: 2018-02-21

How long do filters last

Asked by: Gino
According to the website the filters last 6 months
Answered by: Greta
Date published: 2018-02-06

How long are the hoses for this 

Asked by: Marfe
The diverter hose is about 32 inches, just under 3 feet. Thank you, Aquasana
Answered by: Aquasana Customer Support
Date published: 2018-01-17

Why can't you send me replacement o rings? You sent one large o ring, not what I need. I need two small o rings.

Asked by: Chickie
Hello! I'm sorry to hear that the wrong replacement part was sent. Please contact our service team directly at 866.662.6885 so that we can get the correct part sent out for you. Thank you, Aquasana
Answered by: Aquasana Customer Support
Date published: 2018-01-17

I have a countertop dishwasher. It already installs an adapter into the faucet that allows the hose to easily attach. Does this allow for additional items to be connected? 

Asked by: gwgarner
The diverter hose that comes with this system does not allow for other attachments to be added on. If you would like to contact our service team directly at support@aquasana.com, you can send in a picture of your set up, and we will be happy to take a look and let you know if we think the devices will be compatible. Thank you, Aquasana
Answered by: Aquasana Customer Support
Date published: 2018-01-17

Does your filters filter Radium?

Asked by: CharlieC
The system you selected is not certified to filter radium as Reverse Osmosis is the strongest form of water filtration. Our Reverse Osmosis system, however, is NSF certified to remove 80% of radium. See the performance data sheet here: http://cdn.aquasana.com/assets/AQ-RO-3_Performance_Data.pdf. If you're interested in purchasing this system, here is a link: https://www.aquasana.com/drinking-water-filter-systems/reverse-osmosis-claryum
Answered by: Aquasana Customer Support
Date published: 2018-01-15

Do you carry the stainless steel counter top fillter anymore?

Asked by: Jayne
We no longer carry this item in the brushed metal. You can purchase this item in white.
Answered by: Aquasana Customer Support
Date published: 2018-01-15

Do any of the countertop filters not require hook up to faucet

Asked by: ttbon
ok do any of your filters adapt to the detachable sprayer Kohler
Answered by: ttbon
Date published: 2018-01-12
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