Patent ID: 7264720

Claim:
A pond filter comprising: a housing having a bottom which can be supported on a foundation, and a wall provided with a water inlet, a channel outlet, and a pond outlet, the housing having a transverse X axis and a longitudinal Y axis defining an XY plane which is parallel to the foundation when the bottom is supported on the foundation; a flow path between the water inlet and the pond outlet; a prefiltration unit installed in the flow path and comprising a flat filter screen which is parallel to the X axis and at an acute angle to the Y axis, thereby defining an upper end and a lower end of the screen; a flushing channel connected to the channel outlet and having an inlet opening; a flow barrier disposed between the filter screen and the inlet opening of the flushing channel, the flow barrier extending parallel to the X axis over the entire width of the filter screen, wherein the flow barrier is arranged to block intake water in the Y axis during filtration and is overcome by intake water in the Y axis during flushing; and a filtering device in the flow path downstream of the prefiltration unit.