Used in fertilizer production to provide phosphorus, an essential nutrient for plant growth. Widely applied in the food industry as an acidulant in soft drinks and processed foods to enhance flavor and control pH. Employed in rust removal and metal surface treatment due to its ability to convert iron oxide into a protective phosphate coating. Utilized in dentistry and orthodontics for etching tooth surfaces to improve adhesion of fillings and sealants. Also serves as a dispersing agent in cleaning products and in the production of detergents.