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Many fluoride chemicals used for water fluoridation in the US are purchased from China. Amesbury MA had to stop fluoridation because an unknown substance in their Chinese fluoride was clogging up the system. It turns out to be sand which has to be disposed of. Besides paying China for sand that has to be disposed of, the Chinese fluoride has lead (Pb) in it as was revealed in documentation from the Frostburg , MD water department See: http://www.scribd.com/doc/29108391/Chinese-Fluoride

US fluoridation chemicals aren't clean either. NSF International is a private company that regulates public water supply additives. February 2008 NSF reported that 2% of the 245 fluoridation chemicals sampled from 2000 to 2006 had detectable levels of Lead. 43% had detectable levels of arsenic. (There are approximately 150,000 US public water supplies.) Lead and arsenic are allowable trace contaminants in fluoridation chemicals along with antimony, barium, beryllium, cadmium, chromium, copper, mercury, selenium, and thallium. See:

http://www.nsf.org/business/water_distribution/pdf/NSF_Fact_Sheet.pdf