Fluorides used to fluoridate water supplies are a by-product of the phosphate fertilizer industry, as are many products in use today. The aluminum industry is a consumer of fluoride, not a producer. The fluoride from the phosphate fertilizer industry is a naturally occurring constituent of the phosphate rock and is recovered during the production of the phosphate fertilizer (Sanders, 1996).
Sanders, D. 1996. Centers for Disease Control and Prevention. (personal communication)
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