Poly-aluminium chloride (PAC) is a kind of high efficiency inorganic high molecular coagulant. Poly-aluminium chloride (PAC) is the product between AlCl3 and Al(OH)3. 1. Quick moulding, good activity and good fitrabilitiy. 2. Alkalescence auxiliaries are not necessary. 3. Wide adaptive PH value and wide use. 4. Little salt content in the water treated. 5. Can remove the pollution of heavy metal and radioactive substance. 6. High active ingredients, convenient for storage and transportation