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Counter Top Filter Water Filter
  • Counter Top Filter Water Filter
  • Counter Top Filter Water Filter
  • Counter Top Filter Water Filter
  • Counter Top Filter Water Filter
  • Counter Top Filter Water Filter
  • Counter Top Filter Water Filter
Counter Top Filter Water Filter - is currently on backorder. You may still purchase now though and we'll ship as soon as more become available.

The AQ-4000 Aquasana Countertop water filtration system is the most economical way to get clean, crisp, healthy water for your family.

After devoting 18 months to redesigning and reformulating the company's filter cartridges, Aquasana has created its most powerful and best-performing filtration systems to-date. Unique in both design and functionality, the new Aquasana Claryum™ filtration technology features three distinct stages, including activated carbon, ion exchange and sub-micron filtration. Together, this unique combination forces water under pressure over more than two million square feet of surface area of contaminant-grabbing filtration material — the equivalent of almost 35 football fields or roughly seven blocks in New York City. In addition to reducing a comprehensive list of chemicals and contaminants, Claryum's™ patent-pending selective filtration technology reduces odor and improves the taste of tap water while also preserving its healthiest minerals such as calcium, potassium and magnesium for optimum hydration — which are vital for growth, development and overall health and wellness.

Key features of the Aquasana Claryum™ technology include

  • NSF certified to standards 42 and 53
  • Superior contaminant reduction from the unique triple-process filter technology
  • Great taste from the healthy minerals that stay in your water
  • Long lasting filters that provide 500 gallons or six months of crisp, clear, healthy water
  • All at the same great value — with Aquasana filtered water costing as little as 10¢ a gallon

The healthiest, best tasting water on Earth... 100% satisfaction guaranteed!

This product is not intented for use on water of unsafe or unknown microbiological quality and should only be used on municipal treated water supplies or other potable water sources.

Both cartridges are made with extruded coconut shell carbon, and the B-cartridge is impregnated with BASF® ATS ion-exchange sorbent resin. BASF® ATS powder is a patented high capacity ceramic (titanium silicate) cationic ion-exchanger with high specificity for lead removal from water, even in the presence of competing ions like Calcium, Magnesium as well as other metals.
The A-cartridge is 5 micron absolute, and the B-cartridge is .5 microns absolute, meaning that particles 200 times smaller than a human hair cannot pass through the B-cartridge (human hair is 100 microns in thickness). This allows for filtering out chlorine-resistant parasites, such as Giardia and Cryptosporidia.

Aquasana is the #1 rated home water filtration system in America, works better & costs less than any other brand - see ComparisonChartpdf_icon.

This patented twin cartridge drinking water filter installs in seconds to standard kitchen faucets and provides up to 30 gallons an hour of ultra-filtered high quality water for drinking, cooking and other beverages.
See Aquasana AQ-4000 PerformanceSheetpdf_icon for performance specs.
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Includes filter housing, chrome faucet diverter, and twin filter cartridge set (lasts 6 months / filters 500 gallons - whichever comes first).

Aquasana AQ-4000 Drinking Water Filter is a non-pressurized filter and MUST NOT be installed in a constant hydrostatic pressure environment, such as a fridge filter, or a water cooler filter. Read instructions carefully before making any modifications.

Outer Dimensions: 9" x 7.5" x 3"
Diverter Hose Length: 30"
Replacement Cartridges SKU: AQ-4035 (formerly AQ-4025)

You get the very best water, the best value and the most convenience, at a fraction of the cost of bottled water!


Drinking Water Filter Q & A's

Question: How do I remove the A-cartridge from the AQ-4000 if it is stuck?
Answer: Because it is very important that the A-cartridge not be bypassed by the untreated water, the AQ-4000 forces a strong seal on the A-cartridge. If you are having difficulties removing your A-cartridge, all you need to do is fold up a towel on your kitchen counter, and with the A-cap removed, give the filter a couple of turns (with your fingers), then a light tap or two on the counter, and the cartridge should jump right out. If this does not work for you, please call Aquasana Inc. tech support at 1 (877) FDA-PURE.

Question: If I'm the only one using the filter, can I wait 12 months to change the cartridges?
Answer: The AQ-4000 is certified to treat 500 gallons, which means that we had to prove the performance through 1000 gallons to give you a built in safety window. Even a family of 6 is unlikely to use a full 1000 gallons in a six month period. However, carbon is the building block of life, and will allow bacteria to colonize on its surface as soon as it gets wet. Unlike the AQ-4100 and EQ-300 which use KDF-55 (55% copper, 45% zinc), the AQ-4000 does not contain anything to inhibit bacteria growth. We use B.A.S.F. ATS Sorbent Medium ion exchanger in place of KDF-55 in drinking water filters because it has better 2+ ion affinity at low flow rates and low temperatures. Some companies use silver to prevent bacteria build-up, but recent studies have shown that silver has similar health effects to lead. Silver collects in the left testicle or the left ovary and can cause hypertension, brain damage, and other negative health effects. Companies that use silver in their cartridges must register their products with the FDA as a pesticide. Because there is nothing toxic in our cartridges to prevent bacteria growth, the AQ-4000 will reach detectable levels of heterotrophic bacteria after 7-8 months, and dangerous levels after 12-14 months. To prevent bacteria build-up, the AQ-4000's cartridges should be changed every 6 months, regardless of use. The KDF-55 used in the AQ-4100 and the EQ-300 prevents them from growing bacteria, so a single person using the AQ-4100 Pure Shower System can go a full year between cartridge replacements, and the Rhino EQ-300 can be used until your water bill shows that you've used over 300,000 gallons.

Replacement of Filters Past the Recommended Period of 6 Months Will Cause Premature Diverter Failure and System Cracks