Used in water purification as a coagulant to remove suspended particles and impurities. It helps clarify drinking water and treat wastewater by forming flocs that trap contaminants. Commonly used in antiperspirants due to its ability to temporarily block sweat pores and reduce perspiration. Acts as a firming agent in pickling, helping maintain the crispness of fruits and vegetables during canning. Employed in the tanning of leather to improve texture and durability of the finished product. Used in small amounts in some medicinal astringents and styptics to stop minor bleeding from cuts and scrapes. Historically used in dyeing as a mordant to fix colors onto fabrics, especially in natural dye processes.