Polyaluminum chloride (PAC) is an inorganic substance, a new water purification material, inorganic polymer coagulant, referred to as PAC. It is a water-soluble inorganic polymer between AlCi3 and Al (OH) 3. 

It has highly electric neutralization and bridging effect on colloids and particles in water, and can strongly remove micro poisons and heavy metal ions. The test method can be in accordance. Due to the bridging effect of hydroxyl ions and the polymerization of multivalent anions, polyaluminum chloride is an inorganic high molecular water treatment agent with high molecular weight and high charge.