1, alumina content: the alumina content of liquid polyaluminum chloride is one of its main technical indexes, and the alumina content of CP8 and CP9 is different, which leads to slightly different treatment effect and application scope.

2. alkalinity: alkalinity is the molar ratio of alumina to sodium hydroxide in polyaluminum chloride. Different alkalinity will affect the flocculation effect and stability of polyaluminum chloride, and the alkalinity of CP8 and CP9 is different.