Poly aluminum sulfate and polyaluminum chloride between the performance point of water treatment agent in the polymerization of aluminum sulfate and polyaluminum chloride regarded as a more important and common a pharmaceutical. However, although both polymeric aluminum sulfates and polyaluminium chlorides belong to the family of aluminum salts and also to iron salts, they have many in common with salt, but since they are two agents, they must be different Where. Compare the properties of polymeric aluminum sulfate and aluminum chloride. Compare the retention of the two, filter aid and sizing effect. The results show that polyaluminum chloride is a more effective cationic aggregator than polyaluminum sulfate. Well, we must understand that in the circumstances under which the polymeric aluminum sulfate can fully exert its effect and effect. The first is that the polymeric aluminum sulfate must be used under acidic conditions to be effective, causing corrosion of the papermaking system and poor durability of the paper . In addition, CaCO3 filler under acidic conditions will be chemical reaction CaO and CO2, resulting in a large number of foam, which can not be used, adding excess aluminum sulfate will precipitate the problem.