Polyferric sulfate(PFS) is a new type of environmental product and a inorganic high molecular flocculant, it is the best choice for water purified agent. It can used in drinkable living water, slurry water, industry sewage, city sewage and industry water(such as the paper making waste water, the printing waster water, the massacre waste water, the automobile manufacturing waste water, the beer factory waste water and so on.).