... feed additives of magnesium salt, etc..How to Control the Quality,Service and Price:1.Quality: A. We cooperate and invest large ... scale national factories of Magnesium sulphate. B. We have own warehouse and select good quality to ... inspection,as :SGS,Intertek,BV and so on.2.Service: A. Professional Sodium Silicate Suppliers Since 1995. B. Professional International ...