Bitter salt, also named Epsom salt and sal amarum, molecular structure:MgSO4 7H2O, molecular weight: 246. Bitter salt is a raw material for the production of compounding fertilizer. Plant fed with magnesium compounding fertilizer will grow 15-50% quicker than that fed with compounding fertilizer without magnesium Specification: No. Name Index 1 Appearance Colorless crystal,odorless 2 Alkalinityacidit Neutral 3 Clarity Transparent 4 Chloride % 0.010 5 Weight lost on ignition % 48-52.0 6 Ferric salt % 0.0015 7 Heavy metal % 0.0010 8 Arsenic salt % 0.0002 9 Content % 99.5 We have Magnesium Sulphate Anhydrous