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Aquasana AQ-4000W Countertop Water Filter System

4.3 out of 5 stars 147 customer reviews
| 36 answered questions

Was: $72.94
Price: $58.35 & FREE Shipping. Details
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  • Aquasana drinking water filters remove more contaminants at the best value
  • Filters water under pressure over more than two million square feet of material
  • Latest model featuring easy-change cartridges and a reinforced housing
  • Attaches in minutes to your existing tap and takes only a small space on your counter
  • Aquasana is less expensive than pitcher filters
11 new from $58.35 3 used from $46.68

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Frequently Bought Together

  • Aquasana AQ-4000W Countertop Water Filter System
  • +
  • Aquasana AQ-4035 Drinking Water Filter Replacement
  • +
  • Shower Filter Replacement Cartridge For AQ-4125
Total price: $170.84
Buy the selected items together

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Color: White
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Technical Details

Color: White
  • Easy to Install

Product Description

Color: White

Product Description

The AQ-4000 Aquasana countertop water filter is the most economical way to get clean, crisp, healthy water for your family. Named one of Health Magazine's Healthiest Gadgets for 2011, our countertop drinking water filter offers Aquasana's unbeatable drinking water filtration technology in a convenient, portable package. There's no need for an extra hole in your sink to enjoy healthy, filtered water. Simply attach our diverter to your existing tap, and the countertop unit takes up just a small space on your counter. Water under pressure means better filtration. Our unique twin cartridge system uses a combination of carbon filtration, ion exchange and sub-micron filtration. Your tap water is forced under pressure over filtration material covering more than two million square feet of surface area, so it removes over three times more contaminants than leading pitcher filters. Some water filter systems strip out the healthy Total Dissolved Solids (TDS) leaving you with zero calcium, magnesium and potassium. The Aquasana water filtration system is uniquely designed to remove pollutants, reduce odor, and improve taste while preserving healthy minerals for optimum hydration. Certified contaminant reduction 97.4-Percent of Chlorine, Free Available 99.9-Percent of Particulate 99.9-Percent of Cyst Live Cryptosporidium and Giardia 96.6-Percent of Mercury 99.3-Percent of Lead 81.8-Percent of Methyl Tertiary Butyl Ether (MTBE) 99.0-Percent of Turbidity 99.4-Percent of Volatile Organic Compounds (VOC) by Surrogate 99.0-Percent of Asbestos For a complete list of contaminants reduced, see the Aquasana AQ-4000 Performance Data Sheet. System tested and certified by NSF International against NSF/ANSI Standard 42 and 53 for the reduction claims specified on the Performance Data Sheet. PDF for reference: http://www.aquasana.com/assets/AQ-4000_Install.pdf Your Aquasana countertop water filter comes with a diverter that attaches to your faucet and includes adapters for 13/16” and 15/16” faucets which fit most kitchen faucets. Some specialty faucets may require additional adapters. If your faucet is an all-in-one pull out sprayer, then please consider an under counter water filter instead. Aquasana customer service is available to answer your installation questions at 866-662-6885


aquasana countertop water filter
The countertop filter installs in minutes. [View Larger]
Use only the healthiest water for drinking and cooking.


Transform ordinary tap water into great tasting healthy water with Aquasana’s innovative filter. Get always available, healthy water, right from your tap. No need to ever refill any drip pitchers. This water filter system provides the healthiest, best tasting water by selectively filtering more contaminants like lead, chlorine, and cysts while preserving beneficial minerals like calcium and magnesium. Aquasana gives you exceptional value, with water costing as little as ten cents a gallon when you replace your filters every six months. Each time you replace the filters, you can give yourself credit for not using 4,000 16-ounce plastic bottles.


The AQ-4000W Aquasana under counter water filter, featuring NSF-certified Claryum three-stage filtration, is ultimate convenience. Aquasana's unique Claryum filtration technology is certified to filter 60 contaminants including the following:

  • 97.4% of Chlorine, Free Available
  • 99.9% of Particulate
  • 99.9% of Cyst Live Cryptosporidium &Giardia
  • 96.6% of Mercury
  • 99.3% of Lead
  • 81.8% of Methyl Tertiary Butyl Ether (MTBE)
  • 99.0% of Turbidity
  • 99.4% of Volatile Organic Compounds (VOC)
  • 99.0% of Asbestos

For a complete list of contaminants reduced, see the Aquasana AQ-4000W Performance Data Sheet. System tested and certified by NSF International against NSF/ANSI Standard 42 and 53 for the reduction claims specified on the Performance Data Sheet.

How it Works

  • Unique twin cartridge, three-stage filtration system uses a combination of carbon filtration, ion exchange, and sub-micron filtration.
  • Tap water is forced under pressure over filtration material covering more than two million square feet of surface area.
  • Selective Claryum filtration technology removes harmful contaminants and preserves beneficial minerals like calcium, magnesium, and potassium for optimal hydration.

Compare Aquasana Drinking Water Filter Systems

InstallationCountertopCountertopCountertopUnder SinkUnder SinkUnder SinkUnder Sink
FinishWhiteBlackBrushed SteelChromeBrushed NickelChromeOil-Rubbed Bronze
Faucet / DiverterStandardStandardPremiumStandardPremiumPremiumPremium
Contaminant ReductionNSF CertifiedNSF CertifiedNSF CertifiedNSF CertifiedNSF CertifiedNSF CertifiedNSF Certified

Product Information


Technical Details

Part Number AQ-4000W
Item Weight 3 pounds
Product Dimensions 12 x 7 x 4 inches
Item model number AQ-4000W
Color White
Material plastic
Item Package Quantity 1
Temperature Range 40-90 degrees_fahrenheit
Flow Rate 0.4 GPM
Maximum Pressure 80 PSI
Special Features Easy to Install
Usage Indoor use only
Batteries Included? No
Batteries Required? No

Technical Specification

Additional Information

ASIN B005V08722
Customer Reviews
4.3 out of 5 stars 147 customer reviews

4.3 out of 5 stars
Best Sellers Rank #10,528 in Home Improvements (See top 100)
#27 in Home Improvement > Kitchen & Bath Fixtures > Water Filtration & Softeners > Under-Sink Filters
#859 in Home Improvement > Contractor Supply
Shipping Weight 3 pounds (View shipping rates and policies)
Domestic Shipping Item can be shipped within U.S.
International Shipping This item can be shipped to select countries outside of the U.S. Learn More
Date First Available October 12, 2011

Warranty & Support

Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.


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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Color: White
I bought my counter top water filter about two years ago and have the Water for Life filter replacement plan. The water filter itself seems to work great. I fill up my own bottles before I leave the house and I have good, clean water all day. I ran out while at work one day and filled up my bottle from the tap. The water had so much chlorine in it I had to pour it back out. The problem with this filter system is twofold. A new filter will be sent to you every 6 months on the Water for Life plan. My filters are so clogged after 5 months that I leave a bottle to fill and come back for it. That's how slow the water comes out. A five month plan would be more optimal. The second problem is replacing the filters. I dread replacing them every time. Unless you have applied some sort of lube to the housing you are going to have a fight on your hands getting the caps unscrewed from the bottom of the machine. It is all sharp plastic under there so as soon as you get one to let go you scrape the skin from you knuckles. I have an open wound right now from my efforts. Once you get the machine open then you have to fight and get the old filters out. One has a valve that faces you so that one comes out easily. The other faces away and all you have to grab ahold of it are little fins so get your pliers ready. If the moons are aligned properly the filter will come out in one piece. If not, the cap of the filter will come off and be stuck inside the machine. Good luck with that and get ready to lose some more skin. Go ahead and call customer service when this happens to get a really amusing solution from someone that has no idea how to remove this piece from the machine. I lube that side's valve with olive oil before installing so hopefully it does not get stuck. My advice, wear sturdy gloves when changing the filter and have a full toolbox at hand.
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Color: White
This product is a great solution for those of us who are renting homes/apts and are not able to have a permanent system installed, want something better than pitcher filters, and don't have the money or arrogance to buy bottled water daily.

Even though the actual housing body isn't small, it's very inconspicuous and I have forgotten that it is even there after a day. I initially thought the hose that runs up to the faucet would be tacky and annoying as well, but that too I stopped noticing after a day.

I wish there was a way to guage exactly how much water you use with these filters, because the "six months" or whatever ratings that filter makers give seem to be based on some "average" amount that the "average" person would use, but I have no idea if I'm near that average. Even when I hear the actual gallon amount, I have to believe it totally depends on the quality of your water to begin with and I have no way or interest in keeping track of how many gallons of filtered water are going through the filters. Well, the fact is my first set of filters lasted about 3-4 months before just becoming PAINFULLY slow (over a minute to fill up a glass).

The water tastes deliciously fresh and clean. I can't say I notice a huge taste difference between this and the Brita pitcher filter, but I TRUST that it is doing a better job according to the company's testings. I can't figure a better way to tell for sure.

Bottom line - it's cheaper than drinking bottled water, but more expensive than Brita filters (if you buy in bulk on amazon like I used to), but the bet is that you are spending a little bit more for the assurance that you are filtering out way more than the Brita's were ever intended to.
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Color: White Verified Purchase
I'm been using Aquasana AQ-4000W filters for the last 3+ years. Bought at least 7-8 brand NEW "Water Filter Systems" over that period of time - most of them from Amazon.

As now - I'm getting new one, every 5-6 months (whole filter system, not just replacement filter).


1) Water filtering quality - most best thing about this filter
2) Value (as long as it's keep working)


1) Endless issues with their filter design - for the past 3+ years, I have never yet got a filter system that lasted fully operational for more then 3-4 months, even if I don't use even 1/3 of "water filtering" capacity as advertised. Water leakage, broken water/filter switch, very weak to just dripping water stream - just most common known issues (I'm not alone - here are 100's of reviews with those issues).

2) "Filter Replacement" program is a joke - Filter system itself is not durable and will stop function properly way before you even have a chance to order a new filter (ordered "Filter Replacement" myself - twice, but cannot use it - simple because other parts like Switch, Hose or System water leakage made whole unit unusable).

I know, Aquasana guys trying to improve things and listen to customer's complains/feedback - but common, you need to do it better. I see in the past couple of years how you start sending full assembled filter systems not long time ago and made improvements with Water/Filter switch.

Still, just 2 months after latest purchase of brand-new "Aquasana AQ-4000W Countertop Water Filter System" - whole system is LEAKING very badly now and yes, I have read your website about "solution" - it's not helpful and still don't know why this is second time I'm getting this "Filter System" with exactly same issue.
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