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.

Widely used in thermal power plants, coking plants, paper mills, printing and dyeing plants, electroplating plants, chemical plants and other heavily polluted wastewater treatment (because of its pH range is wider than that of polymeric aluminium chloride, suitable for pH value fluctuation of water quality).