... low heavy metals, big quantity at competitive prices magnesium sulphate feed grade, epsom salt, fully soluble,low heavy metals, big ... Purity:98%min, MgO:16%min, Mg:9.5%min , S:12.5%min, As:3ppm max,Pb:10ppm max, Water ... nitrateMAPMKPmanganese sulphatezinc sulphate phosphorous acidetcWaiting for your inquiries and serve you as a reliable partner from China. Magnesium sulphate feed grade