Polyaluminum chloride (PAC) is an inorganic substance, an emerging water purification material, and inorganic polymer coagulant, abbreviated as polyaluminum. It is a water-soluble inorganic polymer between AlCI3 and Al(OH)3. The general chemical formula is [Al2(OH)nCl6-n]m, where m represents the degree of polymerization, and n represents the PAC product Degree of neutrality.
