Polyaluminum Chloride (PAC) is an inorganic substance, a new type of water purification material, which is a resinous solid in yellow, pale yellow, dark brown, or dark gray. This product boasts strong bridging adsorption properties. During hydrolysis, it undergoes processes such as coagulation, adsorption, and precipitation. The fundamental difference between PAC and traditional inorganic coagulants lies in the fact that traditional inorganic coagulants are low-molecular-weight crystalline salts, while PAC's structure is composed of polymorphic poly-carboxylate complexes. It features rapid flocculation and sedimentation, a wide range of applicable pH values, non-corrosive to pipes and equipment, and significant water purification effects. It effectively removes color, SS, COD, BOD, and heavy metal ions like arsenic and mercury from water. This product is widely used in drinking water, industrial water, and wastewater treatment.