Primarily used in water purification processes to help remove impurities and clarify water by causing suspended particles to clump together and settle out. It is also employed in the textile industry as a mordant to fix dyes onto fabrics, ensuring colorfastness and enhancing dye absorption. In the paper industry, it aids in sizing paper to improve its strength and ink receptivity. Additionally, it serves as an ingredient in some baking powders to provide leavening in baked goods. Its astringent properties make it useful in certain cosmetic and personal care products, such as aftershaves, to tighten skin and reduce irritation.