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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%.
Notice: consumer is responsible for following any state and/or local regulations and plumbing codes pertinent to the purchase, installation and operation of our products.
California Residents: the state of California requires water treatment devices claiming health claims be tested and certified by them - our units are not. Therefore, only aesthetic claims can be made on units shipping to California addresses.
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