Patent ID: 7150826

Claim:
A liquid filtering apparatus for mounting in a housing defining an inlet and a drain, the liquid filtering apparatus being positioned in use to filter liquid flowing from the inlet to the drain, the apparatus comprising a permeable screen rotatable about a substantially horizontal axis and forming a barrier between the inlet and the drain, a rotatable wheel disposed within the screen and coupled to the screen so that rotation of the wheel causes rotation of the screen, the wheel defining vanes extending towards the screen to divide a space around which the screen is arranged into sections which are substantially isolated from each other except via the drain, and a stationary baffle arranged adjacent a portion of the screen to prevent liquid from flowing into the wheel through that portion of the screen, the baffle being positioned such that water flows more readily into sections of the wheel on one side of a vertical plane through the rotation axis than the other sections, whereby the wheel is unbalanced by water retained in sections of the wheel so as to cause the wheel to rotate.