... industrial sewage, such as metallurgy, pottery, coal dressing, papermaking, printing and dye, the leather, and petrochemical industry, etc, extensively, ... with and deal with in Ex-stage of drinking water.Polymeric Ferric Sulfate have great adaptability to acidity of ... off COD, BOD and heavy metal, low cost of water treating.The application and dosage of PFSNameDosageNameDosagedrinking water1:40000--1 ...