Used primarily in water fluoridation to help prevent tooth decay, fluorosilicic acid solution is added to public water supplies in controlled amounts. It serves as an effective and economical source of fluoride ions. The compound is also employed in the production of other fluoride chemicals, including sodium fluoride and aluminum fluoride. In industrial settings, it finds use for etching glass and in metal surface treatment processes. Additionally, it is applied in the fertilizer industry to recover valuable fluorine byproducts during phosphate processing. Safety precautions are essential due to its corrosive and toxic nature.