Abstract: The present invention relates to a filter panel (1) intended for a drum filter (2), said filter panel (1) having multiple filter holes (3) wherein each filter hole (3) has a length L and a width W, wherein at least a substantial amount of the filter holes (3) has a length which is at least 1.5 times the width W, wherein the filter panel (1) has a free surface area which is higher than 81%, preferably at least 83%, more preferably at least 85%, on a side of the filter panel (1) intended to be in contact with a filter cloth of the drum filter (2).

Abstract: In a filter element for use in a filter disc, a plurality of filter elements are arranged on a rotor shaft in a manner allowing liquid communication between the inside of the filter elements and the inside of the rotor shaft. The filter element has at least one passage in an edge structure for liquid communication between the inside of adjacent filter elements when the filter elements are assembled forming a filter disc. The passage has an elevated retention edge extending along at least one edge of the passage. Transportation of particles between filter elements in a disc filter is thereby minimized.

Abstract: Bio-filter unit (1) intended for a fish farming system, said bio-filter unit (1) comprising a container (2) with a filter media (3) and an inner architecture, said inner architecture comprising at least one vertical tube (5) having an open input end (6) and an open output end (7), wherein the bio-filter unit (1) is connected to a pump (8) enabling pumping liquid and filter media (3) from a bottom (9) of the container (2) against a top (10) of the container (2) through said at least one vertical tube (5), wherein an upper plate (15) is arranged inclined downwards from and around the open output end (7) of the at least one vertical tube (5) and ends at a distance from a wall (13) of the container, wherein the upper plate (15) Is perforated and wherein a regeneration water outflow (16) is arranged under the upper plate (15).