| http://www.w3.org/ns/prov#value | - Fluoride, as it occurs naturally in water (as calcium fluoride), can cause many problems at high levels and is even more toxic when it is added to water supplies in the form of fluorosilicic acid, a waste product of the phosphate fertilizer industry that is part of a pollution concentrate that is heavily contaminated with toxins and heavy metals, such as arsenic, lead and cadmium (all carcinogens)
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