iron sulfate heptahydrate 1)FeSO4.7H2O%,98%;Fe,20% 2)package,25kg/bag 3)Usage, additives,fertilizer,water scavenging agent iron sulfate ... Usage: Ferrous sulfate monohydrate is offwhite powder ,used for the manufacture of iron salts, ink, iron oxide red and ... 002-0.0002Fineness (through 180umtest sieve) %≥ 9595-- Iron Sulphate Heptahydrate water scavenging agent