Sand, Activated Carbon, Multimedia and Greensand Media – choice of a filter depends upon the quality and source of water. Ideally for river water filters are placed after clarifier. For deep well water, as the suspended solids are much lesser compared to river water one can design system with filters as pre – treatment without clarifiers. Sand Filter and multi media filter are used for removing traces of TSS while activated carbon filter is used to remove color and organics. Green sand media filter is chosen when Fe and Mn are higher in the raw water.