The fluoride issue is full of confusion—probably intentional. The so called “natural” fluoride in ground water is often discharge from fertilizer and aluminum factories. Even the term “fluoride” , only one of which is the “fluoride” we need a minuscule amount of, calcium fluoride.
That “natural” ground water “fluoride” they use as a baseline could be anything.
Sold a bed to a water plant tech of 30 years in Beavercreek, Ohio some 10 years ago. He said they add fluoride by the fertilizer bag, and he didn’t know why.
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