Polyaluminum Chloride (PAC) is an inorganic substance, a novel water purification material and inorganic polymer coagulant, commonly referred to as polyaluminum. Polyaluminum chloride possesses properties such as adsorption, coagulation, and sedimentation. It is unstable and corrosive. PAC offers advantages including excellent stability in spray drying, broad adaptability to water conditions, rapid hydrolysis, strong adsorption capacity, formation of large and dense flocs, fast sedimentation, low effluent turbidity, and good dewatering performance.