EPSOM SALT, magnesium sulphate hepta ,easily soluble in water, ISO9001 Certified quality We are an ISO9001 certified company in ... China.We supply magnesium sulphate hepta (epsom salt, magnesium ... , S:12.5%min, As:3ppm max,Pb:10ppm max, Water insoluble:0.05%maxPackage in 25kg bags, 1000kg bags, or ...