Changsha lantian chemical company limited. We are a leading manufacturer for manganese sulphate and zinc sulphate mono and heptahydrate, ferrous sulphate, sodium metabisulphite for almost 20 years. Our annual production for manganese sulphate is: 18000mts, for zinc sulphate is: 12000mts. Over 95% of our products exported to international market. Our products is reputable in international market for its good quality and best price. And we have atomic absorption spectrophotometry, can test exactly the heavy mental so that gurantee the products' quality. We have our own mine, so we can supply manganese diozide, manganese dioxide. Should you have any interest on our products, please feel free to contact with us via our e-mail address marketing at lantianchem.com