AQUAMIX SULFAMIC ACID CLEANER is a 99.5% granular sulfamic acid to be dissolved in water. For removal of grout and mortar haze, rust and mineral deposits including efflorescence. Uses: Recommended for use on acid-resistant glazed or dense unglazed ceramic tile. Coverage: One pound yields up to 2-1/2 gallons of cleaning solution which will clean approximately 300 to 500 sq. ft.