Magnesium Sulphate Hepta is white and transparent flowing granule. This product widely applied in the aquaculture, industry, feed additive, fertilizer and so on. We are confident for our product by good quality and competitive price. MAIN CONTENT: 99.47% CHLORIDE CONTENT: (AS NaCl): 0.015% MAGNESIUM SULPHATE (AS MgSO4): 48.60% IRON (AS Fe): 0.015% HEAVY METAL (AS Pb):0.0008% ARSENIC: 0.0002%