I don't think you are correct in alleging that the reason for adding HFA to water is to dispose of a waste product. Hydro- (or hexa-) fluororsilicic acid is a by-product of phosphate fertilizer manufacture. It is also used as an INPUT to aluminum smelting.
I don't think you are correct in alleging that the reason for adding HFA to water is to dispose of a waste product. Hydro- (or hexa-) fluororsilicic acid is a by-product of phosphate fertilizer manufacture. It is also used as an INPUT to aluminum smelting.