Polyferric Sulfate(PFS), also known as Polymeric Ferric Sulfate and Polyferric Sulphate, is an iron-based inorganic polymer coagulant. The solid is light yellow powder and is easily soluble in water; the aqueous solution is a reddish brown transparent solution. It has the advantages of high hygroscopicity, extremely high flocculation ability, fast sedimentation rate and wide application range.