Hydroflurosilicic acid, also known as fluorosilicic acid and hexaflurosilicic acid, is a clear, colorless liquid that is used in a variety of industrial applications. Due to its ease of use over competing technologies, hydroflurosilic acid is commonly used in water fluoridation applications. Hydroflurosilicic acid is also used for hardening masonry and ceramics, as a metal surface treatment and cleaner, pH adjustment in industrial textile processing or laundries, and as an intermediate in the manufacturing of chemicals.