KDF/GAC Cartridge Info

The Crystal Quest KDF/GAC filtration cartridge is a part of many of the Crystal Quest water filter systems. Below are third party test results of this water filter cartridge.


20,000 gallons of city water, spiked with high levels of specific contaminants, was run through a KDF/GAC cartidge. The efficiency shown below was measured AFTER 20,000 gallons had passed through the cartridge (when new, removal is 99+%). Most other non-standard tests show results after only one pass of contaminated water, which does not indicate how the filter will perform towards the end of its life. To pass the NSF-53 protocol, the effluent must be under the EPA Maximum Contaminant Level (MCL) throughout the test.

All concentrations are measured in milligrams per liter (mg/l).

Test Results at 20,000 Gallons
Chemical Influent Effluent Efficiency EPA MCL
THM (chloroform) 0.57 0.029 95% 0.1
Lead 0.19 0.006 97% 0.025
Fluoride (1) 8.26 0.78 91% 1.4
Nitrate (1) 30.7 8.03 74% 10.0
Barium 10.4 0.56 95% 1.0
Arsenic 0.37 0.007 98% 0.05
Cadmium 0.03 0.004 87% 0.01
Chromium VI 0.15 0.011 93% 0.05
Chromium III 0.163 0.003 98% 0.05
Selenium 0.1 0.006 94% 0.01
Mercury 0.006 0.000* 99+% 0.002
Endrin 0.0008 0.000* 99%+ 0.0002
Lindane 0.011 0.0012 89% 0.004
Methoxychlor 0.32 0.0059 98% 0.1
Toxaphene 0.013 0.000* 99%+ 0.005
2,4-D 0.3 0.02 93% 0.1
Silvex (2,4,5-TP) 0.029 0.004 86% 0.01

* - Below detectable limit.
(1) - While this test shows a reduction in these contaminants, KDF is inconsistent in their removal in certain water conditions. We offer special nitrate and fluoride filters, or reverse osmosis, if removal is needed.

A separate test was run on another KDF/GAC cartridge to determine chlorine removal capacity. The challenge solution contained 3 mg/l chlorine (most cities use less than 1 mg/l). 2 mg/l lead was also added. At 20,000 gallons, both were being removed 99.9+%. The test was terminated at 28,400 gallons when the chlorine removal rate hit 90%. The lead removal was still 97.6%.

Not All Water Filter Systems Are Created Equal!

Crystal Quest® water filters remove hundreds of contaminants and LAST A LONG TIME. The unique high capacity and multi-stage design means no more over-priced and less effective water filters with replacement filter cartridges that have to be replaced every 100 to 500 gallons!

Pure Water Essentials offers Crystal Quest® water filtration products because Crystal Quest utilizes the latest technologies in the water industry coupled with 30 years of manufacturing expertise to provide you with high capacity, the most effective, healthiest and great-tasting water conveniently and at the most affordable price. Crystal Quest products are attractive, easy to install and use.

Crystal Quest Water Filter Reviews

The CRYSTAL QUEST® Pitcher Water Filter and Shower Filter were awarded "Best Buys" in the August 2006 issue of Consumers Digest magazine.

The CRYSTAL QUEST® Pitcher Water Filter, Shower Filters, Faucet Mount Water Filters, Countertop Plus Water Filter, Reverse Osmosis Filters, Refrigerator Filters, and Travel Water Filters have been recommended in "The Drinking Water Book - How to Eliminate Harmful Toxins From Your Water" (second edition 2006) by Colin Ingram, on pages 118, 119, 120, 121, 122, 134 and 160.