1. Flocculant, mainly used for purifying drinking water and special water quality treatment of water supply. 2. Polyaluminum chloride PAC is also used for industrial wastewater treatment, such as printing and dyeing wastewater. 3. Polyaluminum chloride PAC is also used in precision casting, medicine,papermaking, rubber, leather, petroleum, chemical industry and dyestuff. 4. Polyaluminum chloride PAC is used as water treatment agent in surface treatment. 5. Main raw materials of anti sweat cosmetics. 6. Some flocculants can be used as food additives.