A screen bowl decanting centrifuge comprising a rotatable bowl (4) and a conveyor assembly (8) adapted, in use, to separate a slurry into solids and liquids components, and an outlet for the liquids component which outlet communicates with the inlet (102) of a perforated bowl section (100) arranged, in use, to filter the liquids component as it passes through the perforations of a screen or screens (13), wherein the perforated bowl section (100) comprises a plurality of removably mounted screen support sections (50).