1.98%Ferrous sulfate hetahydrate 2.direct manufacturer and good price 3.Excellent&High-Efficiency Sale and After-sale Servic Applications:used in feed, preserves, waste water treatmentand water purity, disinfection, rubber,leather, washingpowder, livestock feed, pencils.Specification: ItemNational IndexEnterprise index (FeSO4 · H2O), % , ≥ 98 99 Fe,% 19.7 20 Insoluble matter,%,≤ 0.5 0.0015 Pb,%, ...