PAC (Polyaluminium Chloride) referred to as the PAC. Often referred to as alkaline or coagulant such as aluminum chloride, which is between ALCL3 and AL (OH) 3 between a water-soluble inorganic polymers, the chemical formula is [AL2 (OH) NCL6- NLm] representative of the extent of polymerization in which m, n that the neutral level of PAC products. The color yellow or light yellow, dark brown, dark gray resin-like solid. The product has a strong bridge adsorption properties, in the hydrolysis process, with the condensate, and other physical and chemical adsorption and precipitation processes. 
 PAC with the traditional inorganic coagulant is the fundamental difference between traditional inorganic coagulant for the low molecular weight crystalline salt, and PAC form of changing the structure of the complex composed of multiple carboxyl, flocculation and sedimentation speed, for PH value of the range is wide, non-corrosive for plumbing, water purification effect is obvious, and can effectively support the water-color quality except SS, COD, BOD, and arsenic, mercury and other heavy metal ions, which are widely used in drinking water, industrial water and wastewater treatment areas.