Abstract: Filtration apparatus comprising a first elongate container (1) having a first auger (5) which is rotatable about an inclined axis and a stationary trough-shaped filter screen (3) shaped to be adjacent to a lower peripheral region of the first auger. An inlet (13) for a flowable material to be filtered is provided at a level above the filter screen (3) and a first outlet (15) for filtered liquid is provided at a level below the filter screen (3). The first auger (5) is rotatable so as to urge components of the flowable material along the filter screen (3) from a lower end towards an upper end of the first auger. A second outlet for solid material filtered out of the flowable material is located in the region of the upper end of the first auger (5). The apparatus includes a second elongate container (19) having a second auger (21) closely fitting within the container, the second auger being rotatable about an inclined axis.