Duplex Basket filters are installed where continuous operation is required, where the quantity of impurities is large and the line cannot be shut down for clean out. When collected solids build up and impede flow, diverter valves permit transfer of fluid flow without interruption from one basket to another. In this manner since isolated, the dirty basket can be removed and cleaned. These are available with an option of a manual changeover and automatic changeover of the valve in order to switch between on filter and the other. Duplex Basket filters are also available with automatic cleaning option as Duplex Auto Back wash filters where there is no need to remove the basket for the purpose of cleaning. These are also available with the option of a manual and automatic changeover of the valve.