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Where does the fluoride added to drinking water come from?

April 26, 2017added drinking water fluoride

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Where does the fluoride added to drinking water come from?

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Hydrofluorosilicic acid is a byproduct of the phosphate fertilizer industry. During production of phosphoric acid, the element fluorine is formed and later captured. It is then sprayed with a spring water solution, forming hydrofluorosilicic acid.