... is a kind of inorganic macromolecular coagulant. Poly Aluminum Chloride Brief Introduction 1. PAC is a kind of ... -5.0 3.5-5.0N ( as NH3),% max. 0.01 0.01As,%max. 0.0001 0.0005Cr+6,%max. 0 ... for solid product and 6 months for liquid product. PAC/Poly Aluminum Chloride