... 1,Origin : Tianjin, China 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 ItemTechnical specification (%)Analysis Results(%)1Purity99.599.822Mg9 ... it is widely used in feed additive, aquiclture , Feed grade Magnesium Sulphate