Aluminium Sulphate (Alum) is one of the most widely used coagulants in wastewater and water treatment. It is highly effective in removing suspended solids, turbidity, color, and colloidal particles by promoting coagulation and flocculation, making it an essential chemical in both municipal and industrial treatment processes. When added to wastewater, Alum reacts with water to form aluminum hydroxide flocs. These flocs attract and trap fine suspended particles, organic matter, and other impurities, allowing them to settle rapidly or be removed through filtration. This significantly improves water clarity and reduces the load on downstream treatment systems. Aluminium Sulphate also helps reduce phosphorus levels by forming insoluble phosphate compounds that can be separated from the treated water. This minimizes nutrient pollution and helps protect rivers, lakes, and other natural water bodies from excessive algae growth. Due to its high efficiency, affordability, and ease of application, Aluminium Sulphate is extensively used in municipal wastewater treatment plants, drinking water treatment facilities, textile industries, paper mills, food processing plants, and various industrial wastewater treatment systems.