Used primarily in water treatment processes, this chemical acts as a coagulant to remove suspended particles and impurities. It is widely applied in municipal drinking water and wastewater treatment plants to clarify water by forming flocs that trap dirt, organic matter, and microorganisms. Commonly used in paper manufacturing to improve ink and coating adhesion, it also helps in controlling pH during the pulping process. In the textile industry, it serves as a mordant to fix dyes onto fabrics, enhancing color retention. Found in fire retardants and antiseptics due to its ability to inhibit combustion and microbial growth. It is also used in small-scale gardening applications to lower soil pH and provide aluminum to plants, especially in the cultivation of hydrangeas, influencing flower color. Additionally, it plays a role in the production of other aluminum compounds and in some cosmetic products as an astringent.