1. Good water purification effect: PAC forms large flocs, fast settling speed, which can significantly improve the water clarity and remove suspended matter, organic matter, heavy metal ions in water. 2. Strong adaptability: the adaptability of polymeric aluminium chloride has a wide range of pH value, strong adaptability to the raw water, and can deal with various types of water quality. 3. Less dosage: compared with other coagulants, the dosage of polymeric aluminium chloride is less, which can reduce the cost. 4. Small corrosiveness: the corrosiveness of polymeric aluminium chloride is relatively small, and the influence on equipment and pipeline is small. 5. Easy to operate and manage: the solubility of polymeric aluminium chloride is good, it is easy to mix well with water, and it will not produce harmful gases and substances in the process of using, the operation and management is relatively simple.