Potassium Meta Bi Sulfate Food Grade is a white, crystalline powder with the chemical formula K2S2O5. It is commonly used as a food preservative, antioxidant, and bleaching agent. It is a type of potassium metabisulfite that has been approved for use in food applications. As a food preservative, potassium metabisulfite inhibits the growth of bacteria, yeasts, and fungi, thereby extending the shelf life of food products. Potassium Meta Bi Sulfate Food Grade is commonly used in the production , and other fermented foods.