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Voted "Best Buy" by Consumers Digest Magazine 2003,
2004,2005, 2006 & 2007!

AQ-4000 Drinking Water Enhancement System


The AQ-4000 Drinking Water Enhancement System

is the highest rated home filtration system in America, based on Department Of Health Performance Certifications. Voted “Best Buy” by Consumers Digest Magazine!


No other home filtration system, at any price, has ever produced better results. This system is documented to produce water of higher quality than any brand of bottled water or other filtration system! Our patented twin filter system restores tap water to naturally healthy, high quality drinking water at the touch of a button. This system selectively removes chemical contaminants and heavy metals while leaving in the natural trace minerals for the healthiest, best tasting water on Earth!


Can be installed “Counter-top” or “Under-sink”.

Filters 500 to 1000 gallons or 6 to 12 months between cartridge replacements. Filters Chlorine, Lead, MTBE, VOCs, THMs, Cysts and Turbidity.


Aquasana AQ4000's exclusive dual cartridge, 5 stage, filtration system uses a combination of the most advanced technologies available. This patented process selectively removes contaminants sequentially, in a certain order, based on their level of prevalence and degree of competitiveness. This allows the system to achieve the full potential of each stage of filtration.


Cartridge "A"


  • Stage 1: Removes sediment and turbidity first. These are tiny microscopic particles that can clog the pores of a filter media and reduce its ability to remove the contaminants.

  • Stage 2: Next chlorine is removed, the most concentrated and the most competitive chemical in our water. This allows the following stages to focus on the more difficult task of removing lead and synthetic chemicals. After water has been through these first two stages of filtration it then passes over to the "B" cartridge.

  • This pre-filter Cartridge "A" reduces particles invisible to the human eye (5 microns).

Cartridge "B"


  • Stage 3: First lead is removed by a complex ion exchange process where lead ions are replaced with potassium ions. This exchange is the most effective method for removing dissolved lead and also enhances the natural mineral balance of water. Potassium is also one of the minerals that helps give water a natural spring water taste and a neutral pH.

  • Stage 4: Next is the most challenging and possibly the most important stage, the removal of synthetic chemicals, like herbicides, pesticides and industrial solvents. These are some of the most harmful contaminants found in our water and also the most difficult to remove.


    This is where the AQ-4000 dual cartridge system really differs from other brands.

    Because the competitive influences of chlorine, lead and sediment have already been removed, this Stage 4 can focus on the essential task of eliminating organic chemical compounds, and does so to a higher degree than any other product.

  • Stage 5: In the final stage, a 0.5 micron compressed carbon filter removes water borne parasites or cysts like cryptosporidium and giardia. These chlorine resistant organisms are commonly found in drinking water supplies, causing flu like symptoms for most, but can be fatal to small children and the elderly. This is an essential stage for complete contaminant protection.

  • In Cartridge "B" the coconut shell carbon combines with potassium-charged zeolite to extract lead and replace it with natural potassium ions.

While it seems that every company claims to have the best and latest product or technology for their counter top water filter‚ the quality of the water should be the determining factor. Verifying the value of a home water treatment system is a simple matter of determining the quality and the cost of the water it produces.


Once you know the facts, it's easy to see why Aquasana is the best choice!


No other product, at any price, has ever produced better results than Aquasana!


Click the links on the bottom of this page for Aquasana‘s Performance Data Sheet‚ Department Of Health Certification and the Product Comparison Chart. This information documents the effectiveness of the Aquasana Drinking Water Enhancement System and how it compares to other leading brands.


The Aquasana system was intentionally tested under more challenging conditions than our competitors in order to document its superior capabilities under even the most extreme conditions. Aquasana is proven to filter out contaminants better than any other brand of home water filtration products. Our counter top water filter was rated as "Best Buy" by Consumer Digest Magazine in 2003, 2004,2005 and 2006.

No other water treatment system‚ of any kind or at any price‚ has ever produced better results for lead reduction.  For lead reduction the Aquasana system was challenged at a level 20% higher(170-180 ppb) than the certification requirement of 150 ppb (parts per billion)‚ and still produced lead free water throughout the 1000 gallon test cycle.  It has been medically proven and confirmed by the U.S. EPA that any level of lead in our drinking water poses a health risk‚ especially to small children. Lead free water is a health essential!

The performance testing for the reduction of synthetic chemicals (VOCs) was also documented under more stringent conditions than normal‚ or than is required by the certification standards. Virtually all other companies choose to have this chemical reduction testing performed by adding the challenge chemicals to de-ionized water‚ free from the competitive influences of sediment and chlorine. This unrealistic method is allowed under the required NSF Standard #53, however does not represent real life conditions. In order to demonstrate Aquasana‘s superior performance under real life conditions‚ it was tested by adding the challenge chemicals to regular chlorinated tap water with a moderately high turbidity (sediment) level. This method of testing is considerably more challenging‚ and still the Aquasana system out performed all other brands!


"No level of exposure to a chemical carcinogen should be considered toxicologically insignificant for humans". As stated in a recent report from the National Cancer Institute to the Surgeon General‚ We do not believe in "acceptable levels" for toxic chemicals in our drinking water and this product was designed accordingly.

The Aquasana system produces the very highest quality water‚ and at a price that makes it not only the best product‚ but the best value!

When it comes to something as important as your water‚ make sure it‘s as good as it can be... Aquasana is truly the right choice!


Once you have all the facts, the decision is easy!


Performance Data Sheet


California Certificate


Product Comparison


Introduction of NSF Standard for water treatment


Table Camparison of Quality Technology System


Permulab Lab Reports(Malaysia)1,2