... ,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 ... it is widely used in feed additive, aquiclture , Feed additive Magnesium Sulphate 99.5%