Filtration's a mechanical or physical operation which's used for the separation of solids from fluids (liquids or gases) by interposing a medium through which the fluid can pass, but the solids (or at least part of the solids) in the fluid are retained. It's to be emphasized that the separation isn't complete, and it'll depend on the pore size and the thickness of the medium as well as the mechanisms that occur during filtration. Filtration's used for the purification of fluids: for instance s… (More on Filtration)