... Certificate: ISO9001:2000,SGS InspectionOur ferric sulphate usually is used in mine ,coak plant,steel plant, ... : Fe2(SO4)3. XH2O, X is 4-6.- Fe3+ content : More than 21.5% (m/m) Water insoluble material ... inorganic water purified agent2, fast settle, the time is about 5-30min, with other equipment, the ... not aluminum polltion, is green agent7, The application PH is 4-11, best is 6-9, it can decrease PH ...