... sulfate 2,dosage is small, low cost 3,used in waste water treatment 4,quickly delivery 5,factory hot selling Poly Ferric ... Value: from 4-11 in which 6-9 is best. The PH Value changes very little after water treatment, and reduces the ... matter, %≤0.50.5 ApplicationMainly used on various industrial wastewater treatment, such as paper-making wastewater, municipal wastewater, oily wastewater, ...