The invention relates to a cleaning apparatus (1) for removing solid matter from a liquid, especially for a coolant-lubricant circuit (35). Said cleaning apparatus (1) comprises a hollow cylindrical filter member (2) that separates a crude chamber (6) from a pure chamber (7), an inlet (8) which is located on the crude side and is connected to the crude chamber (6), an outlet (9) which is located on the pure side and is connected to the pure chamber (7), a backwashing device (10) for backwashing the filter member (2) segment by segment, and a discharge mechanism (12) for removing clean solid matter from the crude chamber (6). In order to make it easier to remove clean solid matter from the crude chamber (6), the filter member (2) surrounds the crude chamber (6) while the pure chamber (7) surrounds the filter member (2), and the discharge mechanism (12) is equipped with a screw conveyor (13) which feeds the clean solid matter to a discharge port (14).