Ferrous Sulfate Heptahydrate also known as Green Vitriol is a water-soluble inorganic microelement fertilizer and fine chemical product with 98 purity and effective iron content 19.7. It appears as pale green monoclinic crystals highly soluble in water and slightly weatherable in air. Widely applied in agriculture water treatment and industry it supplements essential iron for crops corrects iron deficiency chlorosis and acts as a flocculant and industrial raw material with stable performance and cost-effectiveness.