We can supply feed grade Zinc sulphate both monohydrate and heptahydrate 1).ZnSO4.7H2O Zn:21%min, As:5ppm max, Pb:20ppm max, cd:30ppm max 2).ZnSO4.H2O Zn:34.5% min, A:5ppm max, Pb:20ppm max, cd:30ppm max 3).Appearance:White crystal powder4).Packing: 25kg/40kg N.W. each, in PP woven bag