The OptiFil® filter is fully automatic, continuous backwash filtration system capable of capturing solids as fine as 1 micron. It can achieve this fine filtration level as a result of a patented backwash mechanism design that prevents solids bypass. In the center of the OptiFil® multi-layer cylindrical screen lies one single filter media layer. That layer is available in metal fabric, sintered stainless steel fleece or woven synthetic media, all in a multitude of micron ratings. Solid contaminants are either retained inside depth media or on top of surface media. After the preset pressure drop across the OptiFil has been reached, the backwash mechanism is triggered and the screen is cleaned methodically in a matter of seconds via backwash. An extremely small percentage of the process flow is used at any given moment for backwashing purposes, therefore the reject volume is extremely low. The filtration process continues throughout the backwash sequence.