99% agri Grade Magnesium Sulfate Heptahydrate main content 99% white crystal very dry, free flowing used in fertilizer Magnesium sulphate,also ... sulfate heptahydrate, epsom salts; bitter salts, when it is used in industry, it is MgSO4·7H2O.It can be ... used in medicine, textile, papermaking, metallurgy, electronics, or used as fertilizer, feedstuff additives.99% agri grade Magnesium sulfate ...