Polyaluminium Chloride(PAC)is a kind of highly effective water purificiant, which is wildly used in the purification of table water,industry water,industry circulation water and wasted and polluted water from pharmacy industry, paper making industry and printing and dying industry, as well as life wasted water. It has the advantages of low cost, less consuption, and an excellent purification effect. As one of the environmental conservation products,PAC is listed in the 10th five-year plan for development of industry by State Development Planning commision of China. PAC is composed with a series of different polymerizing power of abio-macromolecule compound, it occupying best configuration distribution, the main content is which has high electricity polymerization link distribution figure provided with Keggin configuration, due to it have high electric neutralization and united function to cooloid and fine substance in the water, it mightly wipe off micro-poison and heavy metal ion,PAC has stable capability and configuration character. Poly-Aluminium Chloride(PAC) is a kind of innocuous, insipidness and easy dissolve in water with appearance of white or light yellow or yellow colour lipidic from liquid and fine resin solid powder, solid product is easy adsorb damp when exposed in the air. Speciality of blending agglomerati 1. PAC is a kind of inorganic macromolecule agglomeration agent, through the hydroxyl ion bridging function and polyvalent anion polymeric function, creating large molecular and high electricity inorganic molecular. 2. The quality of PAC treated water is better than that of the ferric trichloride and aluminum sulfate treated water, besides, the cost of purified treatment is lower. 3. PAC’s flocculation is faster, sedimentation rtae is higher, and the treatment capability of PAC is larger than that of ferric trichloride and aluminum sulfate. 4. The adaptability of PAC in treating water source with different temperatures, turbidity value and alkalinity is better than that of ferric trichloride and aluminum sulfate. 5. PAC is adaptive with long length PH value, which can act within PH 5.0-9.0, with best effect bewteen. 6. Low causticity, low operation situation requirement. 7. dissolution character of PAC is better than that of ferric trichloriride and aluminum sulfate. 8. Low aluminum and salt remained in PAC treated water, which is beneficial for ion-exchange treatment and preparation of high purified water.