99% agri Grade Magnesium Sulfate Heptahydrate main content 99% white crystal very dry, free ... flowing used in fertilizer Magnesium sulphate,also named magnesium sulfate heptahydrate, epsom salts; bitter salts, when it is used ... or used as fertilizer, feedstuff additives.99% agri grade Magnesium sulfate heptahydrate quality index: AppearanceWhite small granularMain content99% minMgSO448.59% ...