... Used in food, fertilizer, additive, and for industry and agriculture magnesium sulfate heptahydrate1).MgSO4.7H2OMgSO4≥99%, Mg≥9.7%, As≤0. ... crystal3) Used in food, fertilizer, additive, and for industry and agriculture applicationsInner packing: 25kg/PP net bag Magnesium sulfate heptahydrate(MgSO4.7H2O ...