... .0-2.0 Arsenic(As) ,%,max 0.0008 Ferric Sulphate (FS)Chemical Formula: Fe2(SO4)3.XH2O, X=(0-9)Appearance ... and mordant agent.Product Characteristics: Comparing with other flocculation agent, FS has the following characteristics: 1. Iron-based low molecule coagulant ... in polyplastic-linked woven bag , net weight 50kgs. Ferric Sulphate (FS)