Used in fertilizer production to provide phosphorus, an essential nutrient for plant growth. Also employed in food and beverage industry as an acidulant to add tartness, particularly in colas and processed cheeses. In metal treatment, it serves for rust removal and surface preparation by converting iron oxide into stable iron phosphate. Widely used in dental and orthodontic practices for etching tooth surfaces to improve adhesion of fillings and braces. Acts as a pH adjuster in agricultural and industrial water systems. Commonly found in cleaning products for descaling and removing mineral deposits.