Filtration device (100; 100') for fluids, having a housing and at least: - one bolt-shaped screen carrier element (10; 10') which is mounted displaceably in the housing and each of which has multiple screen spaces (11.1, 11.2, 12.1, 12.2) in each of which there is arranged one filter element, wherein at least two pairs of screen spaces (11.1, 11.2; 12.1, 12.2) are arranged on the screen carrier element (10; 10') and wherein the screen spaces (11.1, 11.2, 12.1, 12.2) of each pair are arranged diametrically opposite on the screen carrier element (10; 10'), and - one inlet duct (31.1... 34.1, 31.2... 34.2) and one outlet duct (41.1, 41.2, 41.3; 42.1, 42.2, 42.3) in the housing which, in a production position, are each to be brought into connection with at least one screen space, wherein, in a production position of the screen carrier element (10; 10'), in each case at least one inlet duct (31.1... 34.1, 31.2... 34.2) in the housing leads to each screen space (11.1, 11.2; 12.1, 12.2) and in each case at least one outlet duct (41.1, 41.2, 41.3; 42.1, 42.2, 42.3) in the housing leads away from each screen space (11.1, 11.2; 12.1, 12.2), characterized - in that within the screen carrier element (10; 10') there is no connection between the screen spaces (11.1, 11.2, 12.1, 12.2), - in that there is provided, between the outlet ducts (41.1, 41.2, 41.3; 42.1, 42.2, 42.3) in the housing and the screen spaces (11.1, 11.2, 12.1, 12.2), in each case at least one intermediate duct (13.1, 13.2, 13.3, 14.1, 14.2, 14.3) which extends in the direction of the longitudinal axis of the screen carrier element (10; 10'), wherein for each pair of screen spaces (11.1, 11.2; 12.1, 12.2) there are provided at least two intermediate ducts (13.1, 13.2, 13.3, 14.1, 14.2, 14.3) which are of different lengths in the direction of the longitudinal axis of the screen carrier element (10; 10') and via which: - in a production position of the screen carrier element (10; 10') both screen spaces (11.1, 11.2, 12.1, 12.2) of each pair are connected to the inlet ducts (31.1... 34.1, 31.2... 34.2) and the outlet ducts (41.1, 41.2, 41.3; 42.1, 42.2, 42.3, 42.4) and - in at least one maintenance position(s) of the screen carrier element (10; 10') in the housing a connection can be established on alternating sides between one or other of the screen spaces (11.1, 11.2, 12.1, 12.2) of the pair and at least one outlet duct (41.1, 41.2, 41.3; 42.1, 42.2, 42.3, 42.4). - one bolt-shaped screen carrier element (10; 10') which is mounted displaceably in the housing and each of which has multiple screen spaces (11.1, 11.2, 12.1, 12.2) in each of which there is arranged one filter element, wherein at least two pairs of screen spaces (11.1, 11.2; 12.1, 12.2) are arranged on the screen carrier element (10; 10') and wherein the screen spaces (11.1, 11.2, 12.1, 12.2) of each pair are arranged diametrically opposite on the screen carrier element (10; 10'), and - one inlet duct (31.1... 34.1, 31.2... 34.2) and one outlet duct (41.1, 41.2, 41.3; 42.1, 42.2, 42.3) in the housing which, in a production position, are each to be brought into connection with at least one screen space, - in that within the screen carrier element (10; 10') there is no connection between the screen spaces (11.1, 11.2, 12.1, 12.2), - in that there is provided, between the outlet ducts (41.1, 41.2, 41.3; 42.1, 42.2, 42.3) in the housing and the screen spaces (11.1, 11.2, 12.1, 12.2), in each case at least one intermediate duct (13.1, 13.2, 13.3, 14.1, 14.2, 14.3) which extends in the direction of the longitudinal axis of the screen carrier element (10; 10'), wherein for each pair of screen spaces (11.1, 11.2; 12.1, 12.2) there are provided at least two intermediate ducts (13.1, 13.2, 13.3, 14.1, 14.2, 14.3) which are of different lengths in the direction of the longitudinal axis of the screen carrier element (10; 10') and via which: - in a production position of the screen carrier element (10; 10') both screen spaces (11.1, 11.2, 12.1, 12.2) of each pair are connected to the inlet ducts (31.1... 34.1, 31.2... 34.2) and the outlet ducts (41.1, 41.2, 41.3; 42.1, 42.2, 42.3, 42.4) and - in at least one maintenance position(s) of the screen carrier element (10; 10') in the housing a connection can be established on alternating sides between one or other of the screen spaces (11.1, 11.2, 12.1, 12.2) of the pair and at least one outlet duct (41.1, 41.2, 41.3; 42.1, 42.2, 42.3, 42.4). - in a production position of the screen carrier element (10; 10') both screen spaces (11.1, 11.2, 12.1, 12.2) of each pair are connected to the inlet ducts (31.1... 34.1, 31.2... 34.2) and the outlet ducts (41.1, 41.2, 41.3; 42.1, 42.2, 42.3, 42.4) and - in at least one maintenance position(s) of the screen carrier element (10; 10') in the housing a connection can be established on alternating sides between one or other of the screen spaces (11.1, 11.2, 12.1, 12.2) of the pair and at least one outlet duct (41.1, 41.2, 41.3; 42.1, 42.2, 42.3, 42.4).