Filter unit

A filter unit, having:

• at least one warp-knitted spacer which comprises a first and a second cover layer having in each case a multiplicity of openings which are delimited by peripheral regions, wherein threads extend from the peripheral regions of the first cover layer to peripheral regions of the second cover layer, and wherein the at least one warp-knitted spacer is at least rolled or rolled and twisted upon itself more than once, and further wherein:
• at least one of the first cover layer, the second cover layer, and/or the threads of the warp-knitted spacer are provided with disinfecting means, antimicrobially acting means, and/or a biofilm;
• the at least rolled or rolled and twisted warp-knitted spacer is compressed in a region that is rolled or rolled and twisted upon itself more than once in a direction that is transverse to or perpendicular to the first and second cover layers;
• the filter unit has the at least one warp-knitted spacer as a filter body, wherein the filter unit has a receptacle for receiving the warp-knitted spacer as the filter body;
• the receptacle has at least one movable slider element which is configured to be movable between a starting position in which the warp-knitted spacer is decompressed or unfolded and an end position in which the at least one warp-knitted spacer is compressed transversely to the first and second cover layers to a maximum by the at least one movable slider element, so that a flow of liquid through the warp-knitted spacer between the first and second cover layers is still possible;
• the receptacle is provided with an inlet funnel portion which tapers off in such a manner that the at least one warp-knitted spacer is compressed transversely to its cover layers;
• and
• the receptacle is provided with an outlet funnel portion which expands in such a manner that the at least one warp-knitted spacer unfolds, or which tapers off in such a manner that the at least one warp-knitted spacer is compressed transversely to its cover layers.