The best choice of water purification agent polyaluminium chloride wastewater treatment Polyaluminum chloride is a kind of new and efficient inorganic polymer coagulant commonly used internationally. The chemical formula is [Al2 (OH) nCl6-n] m, Compression double layer, adsorption neutralization, adsorption bridging, sediment net catch and other mechanisms of action, so that fine suspended particles and colloidal particles in the water destabilization, aggregation, flocculation, coagulation, sedimentation to achieve purification effect. Is widely used in water plants, power plants (thermal power plants) and other types of factories water and industrial water purification and various types of factories such as chemical plants, smelters, petrochemical plants, paper mills, printing and dyeing plants, dyeing plants and other industrial wastewater treatment. Its performance is superior to the traditional low molecular weight inorganic salts such as aluminum sulfate, ferrous sulfate and so on. Another dosing less, alum large, in addition to COD, color and suspended solids good performance and so on. This technology uses aluminum bauxite or aluminum plant by-product of aluminum ash, industrial hydrochloric acid or waste hydrochloric acid as raw material, one-step production of polyaluminum chloride, product quality in line with GB15892-1995 standards, to the advanced level of similar foreign products.