Sodium fluorosilicate is widely used as a fluoridation agent in water treatment processes to prevent dental cavities by adjusting fluoride levels in drinking water. It is also employed in the production of opalescent glass, enamels, and ceramics, where it acts as a flux to lower melting points and improve material properties. In the construction industry, it serves as a concrete hardener and waterproofing agent, enhancing the durability of structures. Additionally, it is utilized in the manufacturing of pesticides and insecticides to control pests in agricultural settings. Its role as a preservative in wood treatment helps protect against fungal decay and insect damage. In metal surface treatment, it is used in the production of aluminum and magnesium alloys for improved corrosion resistance.