see, the calcium should balance it. how much?
Carter (1928) determined the solubility of laboratory precipitated calcium fluoride in distilled water at 25C at a pH of 6.4. He reported a calcium fluoride solubility of 0.004 grams (g) per 100 cubic centimeters (cc) of solution, or 40 mg CaF2/L.
so, it's not dangerous.
and it will probably work.
great.