Used in fertilizer production to provide phosphorus essential for plant growth. Commonly employed in food and beverage industry as an acidulant in soft drinks to impart tartness and act as a preservative. Utilized in dental and orthodontic treatments for etching tooth surfaces to improve adhesion of fillings and braces. Serves as a rust converter and metal surface treatment agent by reacting with iron oxide to form a protective phosphate coating. Applied in cleaning products for removing mineral deposits and scale. Also used in pharmaceuticals as an acidifier and in buffer solutions to maintain pH stability.