Polyaluminium chloride is an efficient flocculant and water purifying agent, mainly used in water treatment. It can effectively remove suspended solids and impurities from water, improving water quality. Its hydrolyzed solution is acidic, with a fast hydrolysis rate, strong adsorption capacity, and the formed flocs are large and dense, resulting in rapid sedimentation, low effluent turbidity, good dewatering performance. In addition, polyaluminium chloride also has thermal stability and good solubility.