... 2, MgSO4.7H2O 3, white crystal magnesium sulphate hepta ,99.5% min 1,Origin : Tianjin, China 2, MgSO4. ... 7H2O 3, white crystal MAGNESIUM SULPHATE(feed grade) NoTest ... 00020.00019Heavy metal0.0010.000310PH5-86.511Size0.1-10.1-112LookWhite crystalline substanceWhite crystalline substanceFirst Quality Packing ... additive, aquiclture , Feed grade Magnesium Sulphate