A filtering apparatus has a plurality of filtering elements (9) in a filter housing (1), a filter inlet (45) and a filter outlet (43). During the filtration operation, one of the filtering elements (9) can be back-flushed by a back-flushing device (13, 21). The back-flushing device has a pressure control device (13) including a hydraulic accumulator (13). One accumulator fluid chamber (67) can be filled during the filtration operation with a quantity of filtered fluid and can be connected for a back-flushing operation via a back-flushing guide (21) to the clean side (59) of the filtering clement (9) to be cleaned. Another accumulator fluid chamber (79) can be subjected to a media pressure.