A water filter for filtering the water of pools, comprising: a filter housing including side walls and bottom and top end walls 20, 21 attached to the side walls so as to close the filter housing, an annular filter structure with a central passage rotatably supported by the bottom and top end walls (20, 21) a nozzle tube arranged in the housing along the filter structure and having nozzle openings directed toward the filter structure for washing deposits off the filter structure during cleaning operation of the filter structure, a drive device for rotating the filter structure, a supply pipe connected to the filter housing for conducting pool water to the housing space around the filter structure and directing the pool water through the filter structure into the central passage of the filter structure, and a return pipe connected to the central passage of the filter structure for receiving the filtered water and conducting it back to the pool, characterized in that said filter structure is positioned in the filter housing in an off-center position so that at one side the filter structure is arranged in close proximity of the side wall of the housing but, at the opposite side, is arranged spaced from the side wall so as to form adjacent the filter structure a larger housing space extending over the length of the filter structure, said drive device is disposed on the top end wall with a drive shaft extending through the top end wall, said supply pipe is connected to the bottom end wall of the housing in the area of said larger housing space, said return pipe is connected to the bottom end wall of the housing in axial alignment with the central passage of the filter structure, and two nozzle tubes are arranged in the larger housing space in spaced relationship and pivotally supported so that the jets from the nozzles of the nozzle tubes can be directed in different adjustable directions onto the filter structure. a filter housing including side walls and bottom and top end walls 20, 21 attached to the side walls so as to close the filter housing, an annular filter structure with a central passage rotatably supported by the bottom and top end walls (20, 21) a nozzle tube arranged in the housing along the filter structure and having nozzle openings directed toward the filter structure for washing deposits off the filter structure during cleaning operation of the filter structure, a drive device for rotating the filter structure, a supply pipe connected to the filter housing for conducting pool water to the housing space around the filter structure and directing the pool water through the filter structure into the central passage of the filter structure, and a return pipe connected to the central passage of the filter structure for receiving the filtered water and conducting it back to the pool, said filter structure is positioned in the filter housing in an off-center position so that at one side the filter structure is arranged in close proximity of the side wall of the housing but, at the opposite side, is arranged spaced from the side wall so as to form adjacent the filter structure a larger housing space extending over the length of the filter structure, said drive device is disposed on the top end wall with a drive shaft extending through the top end wall, said supply pipe is connected to the bottom end wall of the housing in the area of said larger housing space, said return pipe is connected to the bottom end wall of the housing in axial alignment with the central passage of the filter structure, and two nozzle tubes are arranged in the larger housing space in spaced relationship and pivotally supported so that the jets from the nozzles of the nozzle tubes can be directed in different adjustable directions onto the filter structure.