Sodium Tripolyphosphate (STPP) is a white crystalline granular or powdered substance at room temperature, readily soluble in water. Its aqueous solution is weakly alkaline due to hydrolysis. As an inorganic condensed phosphate, its chemical properties are primarily characterized by its abilities to chelate, disperse, emulsify, and buffer pH: it can bind with metal ions such as calcium and magnesium in water to form soluble complexes, thereby softening hard water. Based on these core characteristics, its primary traditional application is as the main builder in synthetic detergents, used to enhance cleaning power, soften water, and prevent soil redeposition. Simultaneously, it is commonly used in the food industry as a moisture retention agent and quality improver (e.g., in meat products, aquatic products). It also serves as a dispersant and buffer in industries such as ceramics, textiles, and petroleum extraction. (It should be noted that due to its potential to contribute to eutrophication in water bodies, its use in detergents is restricted or being replaced in some regions.)