Abstract: An apparatus for filtering liquids comprises a substantially cylindrical shaped and horizontally placed filter-casing in which at least one supporting member is journaled for rotation substantially about the axis of the casing. The supporting member is provided with a number of hollow rotating shafts, evenly spaced around its axis of rotation, and each shaft carries at least one disc-shaped filter-element. The filtrate discharge from the disc-shaped filter elements passes through the hollow rotating shafts to an outlet-conduit mounted stationary with respect to the supporting member. A conveying trough provided with a conveying screw is arranged substantially in aligmment with the axis of rotation of the supporting member to transport the filter-cake dislodged from the filter-elements and received by the trough out of the filter-casing.