Polyaluminium chloride (PAC) is high-efficient, cheap and nontoxic inorganic high molecular compound. It's easily soluble in water. In the hydrolytic process, it is accompanied with the chemical processes such as electrochemistry, coagulation, absorption and precipitation. The product has the features including wide applicable range of PH value, large granule and quick speed in sedimentation. It's widely used in treating the domestic drinking water, domestic sewage and industrial wastewater. Application 1. City water supply and drainage purification, such as river, reservoir water and groundwater. 2. Industrial water purification. 3. City sewage treatment. 4. Useful material recovery in industrial waste water and waste residue; promote the settlement of pulverized coal in coal washing waste water; recovery of starch in manufacture process. 5. All kinds of industrial waste water treatment, such as dyeing waste water, leather fluoride waste water, heavy metal waste water, oily waste water, paper making waste water, waste water treatment, mining waste water, brewing waste water, metallurgical waste water and meat processing waste water etc. 6. Waste water treatment. 7. Paper-making sizing, sugar refining, casting, medicine refining, cement quick setting and cosmetics raw materials etc.