Abstract: A filter in which liquid flows through a plurality of filter elements wherein each filter element has a pair of valves for closing off the ends of the filter elements in turn for filtering and backwashing. The valves are mounted on a common stem operated by an actuator. With the actuator on, the backwashing or cleaning valve is closed and the remaining or inlet valve is open. With the actuator off, the inlet valve closes and the backwashing valve is opened.