Filtering device (100; 100') for highly viscous media, having at least: - a housing (10; 10'), which has a front housing element (11; 11') with at least one inflow channel (15; 15') and has a rear housing element (12; 12') with at least one outflow channel, - a screen wheel (20; 20'), which is mounted rotatably between the housing elements (11, 12; 11', 12') and has a number n of screen cavities (21.1,..., 21.7; 21.1',..., 21.8'), which are each to be provided with at least one screen insert element and, for sealing with respect to the housing elements (11, 12; 11', 12'), are each surrounded by at least one sealing web; - a filtering region (17; 17'), which is covered by the housing (10; 10') and has a flow connection with the inflow channel (15; 15') and the outflow channel and in which at least one screen cavity (21.1,..., 21.7; 21.1',..., 21.8') can be flowed through, - a maintenance region (16; 16'), in which at least one screen cavity (21.1,..., 21.7; 21.1',..., 21.8') is exposed outside the housing (10; 10') and/or is accessible from a housing outer side; - two blocking regions (18.1, 18.2; 18.1', 18.2') in the housing (10; 10'), which are each formed between the filtering region (17; 17') and the maintenance region (16; 16') and in which in each case at least one screen cavity (21.1,..., 21.7; 21.1',..., 21.8'), together with sealing web, can be covered completely by the front and rear housing elements (11, 12; 11', 12') and has no flow connection with the inflow channel (15; 15') and the outflow channel, characterized - in that, on the screen wheel (20; 20'), multiple screen cavities (21.1,..., 21.7; 21.1',..., 21.8') situated one next to the other are combined to form at least one filter group (2; 2', 4'), which, in the case of at least partial overlapping with the filtering region (17; 17') of the housing (10; 10'), can be flowed through in a joint manner, wherein that area on the screen wheel (20; 20') which is covered by the filtering region (17; 17') of the housing (10; 10') is larger than a screen cavity (21.1,..., 21.7; 21.1',..., 21.8'); - and in that, on both sides, next to the filter group (2; 2', 4'), there is provided on the screen wheel (20; 20') in each case at least one closed blocking segment (23; 23.1', 23.2'), which, when positioned in the blocking regions (18.1, 18.2; 18.1', 18.2') of the housing (10; 10'), is sealed off with respect to the housing elements (11, 12; 11', 12') on both sides of the screen wheel (20; 20'), wherein the blocking regions (18.1, 18.2; 18.1', 18.2') in the housing (10; 10') are in each case larger than or equal in size to a screen cavity (21.1,..., 21.7; 21.1'..., 21.8'), together with sealing web. - a housing (10; 10'), which has a front housing element (11; 11') with at least one inflow channel (15; 15') and has a rear housing element (12; 12') with at least one outflow channel, - a screen wheel (20; 20'), which is mounted rotatably between the housing elements (11, 12; 11', 12') and has a number n of screen cavities (21.1,..., 21.7; 21.1',..., 21.8'), which are each to be provided with at least one screen insert element and, for sealing with respect to the housing elements (11, 12; 11', 12'), are each surrounded by at least one sealing web; - a filtering region (17; 17'), which is covered by the housing (10; 10') and has a flow connection with the inflow channel (15; 15') and the outflow channel and in which at least one screen cavity (21.1,..., 21.7; 21.1',..., 21.8') can be flowed through, - a maintenance region (16; 16'), in which at least one screen cavity (21.1,..., 21.7; 21.1',..., 21.8') is exposed outside the housing (10; 10') and/or is accessible from a housing outer side; - two blocking regions (18.1, 18.2; 18.1', 18.2') in the housing (10; 10'), which are each formed between the filtering region (17; 17') and the maintenance region (16; 16') and in which in each case at least one screen cavity (21.1,..., 21.7; 21.1',..., 21.8'), together with sealing web, can be covered completely by the front and rear housing elements (11, 12; 11', 12') and has no flow connection with the inflow channel (15; 15') and the outflow channel, - in that, on the screen wheel (20; 20'), multiple screen cavities (21.1,..., 21.7; 21.1',..., 21.8') situated one next to the other are combined to form at least one filter group (2; 2', 4'), which, in the case of at least partial overlapping with the filtering region (17; 17') of the housing (10; 10'), can be flowed through in a joint manner, wherein that area on the screen wheel (20; 20') which is covered by the filtering region (17; 17') of the housing (10; 10') is larger than a screen cavity (21.1,..., 21.7; 21.1',..., 21.8'); - and in that, on both sides, next to the filter group (2; 2', 4'), there is provided on the screen wheel (20; 20') in each case at least one closed blocking segment (23; 23.1', 23.2'), which, when positioned in the blocking regions (18.1, 18.2; 18.1', 18.2') of the housing (10; 10'), is sealed off with respect to the housing elements (11, 12; 11', 12') on both sides of the screen wheel (20; 20'), wherein the blocking regions (18.1, 18.2; 18.1', 18.2') in the housing (10; 10') are in each case larger than or equal in size to a screen cavity (21.1,..., 21.7; 21.1'..., 21.8'), together with sealing web.