Ferrous sulphate heptahydrate The products are mainly used in water coagulant treatment, Aluminum-salt substitutes. This product can be used as a water purification agent. Also can be used as a neutralizer of cyanide, hydrogen sulfide deodorant. The mainly specification is as follows, CONTENT98%MIN FE 20%MIN Pb8PPM MAX Insoluble matter in water 0.2%MAX Cd 1PPM MAX As1 PPM MAX packing in 25kg pp bag with one pe bag inside.