MgSO4.7H2O Industry Grade, transparent crystal, main contain 99.5%min, Mg 9.81%min, used as water treatment... MgSO4.7H2O Industry Grade used as water treatment We are manufacturer of MgSO4.7H2O,and cerntainly we have best price with good quality. MgSO4.7H2O Industry Grade quality index: AppearanceWhite small granularMain content99.5% minMgSO448.59% minMgO16.27% minMg9.81% minPH(5W/V%Sol)5- ...