Poly aluminum chloride possesses strong bridging adsorption properties. During the hydrolysis process, physical-chemical processes such as flocculation, adsorption, and precipitation occur concurrently. The fundamental difference between polyaluminium chloride and traditional inorganic coagulants lies in their structural composition. Traditional inorganic coagulants are low-molecular-weight crystalline salts, whereas polyaluminium chloride consists of structurally diverse polycarboxylate complexes. It exhibits rapid flocculation and precipitation, a wide pH applicability range, no corrosion to pipelines or equipment, and显著 water purification effects.