Polyaluminium Chloride is PAC for short.It is a kind of water-soluble inorgani polymers with high molecular weight .The structural formula is [AL2( OH) nCL6- nLm] ,in which the m represents the degree of polymerization, the n means neutral degree of PAC.The product is the yellow or thin yellow, deep brown, charcoal gray resin form solid.This product has stronger function of absorbing .In water solving process, some physical and chemical processes occurs accompanyingly such as coagulate, adsorbing, precipitation and ect. 
PAC is made up of multicomponent hydroxy complex.It has high rapidity of flocculation and deposition ,and been applied to the wide breadth PH value scope.It has no causticity to the pipe equipments,obvious effect of cleaning water and wiping off SS、COD、BOD ，and some heavy metal ions such as As ,Hg...ect in water.This pruduct is applied to the drinking water,industry water and dirty water disposing fields.

Using method:
1.Solid product is put into the water to dissolve according to the 1:3 proportion.Then add 10-30 times amount of water to which concentration you need to use.
2. The best quantity needed may be according to the raw water's turbidity to be decided.Usually when the turbidity of the raw water is 100-500mg/L,the quantity needed is 10-20kg is needed in 1000mt raw water.