... .519.1Reducing substances (counted by Fe2+), % , ≤0.150.01Basicity, %9.0-14.014.0PH (1% aq. solution)2.0-3 ... 4-11, optimum PH value range is 6-9, after purification of raw water PH value and ... add soluble alum pool can use polymeric ferric sulfate.9, polymeric ferric sulfate should be stored in dry, ... PE liner. n.w. 25kg.PAC FOR OIL INDUSTRIAL Spray dried PFS ( polymeric Ferric Sulphate ) used in ...