Our company offer high quality Ferrous sulphate mono / hept, it's used in fertilizer, water treatment, ... feed additives, etc. Our company offer high quality Ferrous sulphate mono / hept, it's used in fertilizer, water treatment ... , feed additives, etc.Product: Ferrous Sulphate Heptahydrate crystal F.M.: FeSO4.7H2OSpecs.: FeSO4.7H2O98% min ...