A device for filtering liquids and a filter unit for use in such a device.

A device for filtering liquids has an annular disc (1) with at least one perforated side wall. A plurality of separate sections (14) of a filter medium are applied onto frames (13) and each said section covers a part of the perforated side wall. According to the invention, the separate sections (14) of filter medium are attached to the respective frames (13), such that each section and its frame form a filter unit (12) separate from the perforated side wall, each filter unit being releasably connected to the disc. The filter units can be made light-weight and suitably identical, which facilitates exchange of filter units with defective sections of filter medium for new filter units.