Mag Excel Exports Private Limited offers Green Heptahydrate Ferrous Sulphate with Precise pH Value. Mag Excel Exports Private Limited has obtained an ISO 9001:2000 certifications. Green Heptahydrate Ferrous Sulphate with Precise pH Value is primarily used as a precursor to other iron compounds. Green Heptahydrate Ferrous Sulphate with Precise pH Value work as a reducing agent and used for the reduction of chromate in cement. It is sometime added to the cooling water flowing through the brass tubes of a turbine condenser as it forms a corrosion-resistant, protective coating on the inside of the tube.