Polyaluminum chloride is a necessary agent for potable water and special water treatment Poly aluminum chloride Alias ​​Basic aluminum chloride PAC, is a coagulant essential for drinking water treatment and special water treatment. It is produced by the bridging effect of hydroxyl ions and the polymerization of polyvalent anions of higher molecular weight, higher charge of inorganic polymer water treatment agents. PAC mainly through the action of compressing double layer, adsorbing neutralization, adsorption bridging, sediment net catching and other mechanisms, so that the fine suspended particles and colloidal particles in water detachment, aggregation, flocculation, coagulation, sedimentation in order to achieve the effect of purification treatment. Because of these PAC features are widely used in waterworks, power plants and other types of factory water and industrial water purification and various types of factories such as chemical plants, petrochemical plants, paper mills, printing and dyeing and other industrial wastewater treatment and purification. Whether from the purification effect or safety are superior to the traditional low molecular weight inorganic salts such as aluminum sulfate, ferrous sulfate and other coagulants. Dosage can be achieved small, alum large, in addition to COD color and suspended solids and many other advantages.