ferrous sulphate heptahydrate FeSO4.7H2O: 98% min. Fe: 19.7% min. ferrous sulphate monohydrate FeSO4. H2O: ... : 30% min ferrous sulphate Types Name of specs.HeptahydrateMonohydrateFeSO4.7H2O, % ≥98-FeSO4.H2O,% ≥-91Fe, % ≥19.730Pb,% ≤0.0020.002As,% ≤0.00020 ... woven bag of 25kgs.net each. ferrous sulphate heptahydrate/monohydrate high quality