... , 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 ... crystalline substanceWhite crystalline substanceFirst Quality Packing : in 25kgs with 40bags in one pallet it is widely used in feed additive, aquiclture , Feed grade Magnesium Sulphate