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PHYSICAL REMOVAL OF MICROBIAL CONTAMINANTS IN DRINKING WATER – WATTS PREMIER INC. WP-4V DRINKING WATER TREATMENT SYSTEM
Citation:
NSF INTERNATIONAL. PHYSICAL REMOVAL OF MICROBIAL CONTAMINANTS IN DRINKING WATER – WATTS PREMIER INC. WP-4V DRINKING WATER TREATMENT SYSTEM. U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-06/131, 2006.
Impact/Purpose:
to inform the public
Description:
The Watts Premier WP-4V four-stage POU RO system was tested for removal of bacteria and viruses at NSF’s Drinking Water Treatment Systems Laboratory. Five systems were challenged with the bacteriophage viruses fr and MS2, and the bacteria Brevundimonas diminutaEM. The virus challenges were conducted at three different pH settings (6, 7.5, and 9) to assess whether pH influences the performance of the RO membrane. The bacteria challenges were conducted only at pH 7.5. The challenge concentrations ranged from 3.8 to 5.0 logs for the viruses, and 6.4 to 7.2 logs for the bacteria. The log reductions ranged from 1.3 to 6.4 log10 for B. diminuta, with an average of 2.1 log10. The virus log reductions ranged from 1.4 to 3.6 log10 for fr, and 1.2 to 3.7 log10 for MS2. The average virus log10 reductions were 2.5 and 2.7, respectively. The virus challenge data does not indicate that the pH of the challenge water influenced removal by the RO membrane. See Table VS-2 below for the complete log reduction data.