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ENVIRONMENTAL TECHNOLOGY VERIFICATION REPORT, REMOVAL OF ARSENIC IN DRINKING WATER: WATTS PREMIER M-SERIES M-15,000 REVERSE OSMOSIS TREATMENT SYSTEM
NSF International. ENVIRONMENTAL TECHNOLOGY VERIFICATION REPORT, REMOVAL OF ARSENIC IN DRINKING WATER: WATTS PREMIER M-SERIES M-15,000 REVERSE OSMOSIS TREATMENT SYSTEM. U.S. Environmental Protection Agency, Washington, DC, 2004.
to present information
Verification testing of the Watts Premier M-Series M-15,000 RO Treatment System was conducted over a 31-day period from April 26, 2004, through May 26, 2004. This test was conducted at the Coachella Valley Water District (CVWD) Well 7802 in Thermal, California. The source water was a chlorinated groundwater supply. Based on the manufacturer's recommendations, the unit was operated at an average inlet pressure of 135 pounds per square inch (psi), water recovery of 54%, flux of 35 gallons per square-foot per day (gfd), and a specific flux of approximately 0.37 gfd/psi at 25 degrees Celsius (C). The total arsenic (As) concentration in the feed water averaged 14 micrograms per liter (ug/L) during the testing period. The M-15,000 RO Treatment System reduced the arsenic levels to below detection (1.0 ug/L) for all but the last two samples, which were 1.4 and 1.2 ug/L. Six sets of samples were speciated and the dominant form of arsenic was As(V).
The system operated for 27 days of the 31-day verification period, with three system shut downs due to operational issues associated with the pre-filter. The verification study indicated that arsenic can be removed by the M-15,000 RO Treatment System, but depending on the source water characteristics, the appropriate pre-filter selection is important to prevent clogging of the pre-filters.