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 economical and effective source of fluoride ions. The solution is also employed in the production of other fluoride compounds and in metal surface treatment processes, such as aluminum etching and cleaning. In some industrial applications, it is used for the manufacture of synthetic cryolite and fluosilicate salts. Due to its corrosive nature, handling requires careful control and appropriate safety measures.