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  Environmental Technology Verification Report, Removal of Chemical Contaminants in Drinking Water, Watts Premier Incorporated WP-4V Drinking Water Treatment System (54 pp, 788 KB) (EPA/600/R-06/005) November 2005
Verification Statement (PDF) (5 pp, 72 KB)

The Watts Premier Incorporated WP-4V point-of-use drinking water treatment system was tested for removal of aldicarb, benzene, cadmium, carbofuran, cesium, chloroform, dichlorvos, dicrotophos, fenamiphos, mercury, mevinphos, oxamyl, strontium, and strychnine. The WP-4V uses a reverse osmosis (RO) membrane, a sediment filter, and activated carbon filters to treat drinking water.

The system was first tested with only the RO membrane component in place. The target challenge concentration for each chemical for the RO membrane tests was 1 milligram per liter. Following the RO membrane challenges, the post-membrane carbon filter component was challenged alone with each chemical that the RO membrane did not remove to below 30 micrograms per liter. Based on this criterion, the carbon filter was challenged with benzene, chloroform, and mercury. The target challenge concentration for the carbon filter tests was the maximum effluent level measured during the RO membrane tests.

A total of 20 RO membrane components were divided into ten pairs and tested. Only one pair of membranes was tested for removal of each chemical. Each RO membrane chemical challenge was conducted over a one-day period. Influent and effluent samples were collected during the operation period and the next morning. The post-membrane carbon filter challenges were conducted over a 15-hour duration. Two filters were tested for each chemical challenge, and each pair was used for only one challenge. Influent and effluent samples were collected at the beginning, middle, and end of the challenge period.

The WP-4V reduced all of the challenge chemicals by 98 percent or more.


Jeff Adams

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