For comparative purposes, it is worth noting that municipal drinking water treatment facilities add polymer directly to the drinking water; industrial sand operations add polymer to the sand wash water, which is part of the industrial sand process and not a source of drinking water. These polymers are also approved by the National Sanitation Foundation (NSF) and American National Standards Institute (ANSI) NSF/ANSI Standard 60 for treatment of drinking water. The maximum allowable DADMAC monomer concentration in drinking water established by NSF/ANSI (at the request of the United States Environmental Protection Agency (US EPA)) is 50 ppb [2]. By comparison, approximately 3 ppb DADMAC monomer is present in the wash water used in industrial sand mining operations. Click Here For Complete Article Text
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