N P Innovation Ab

Hydrotech Nils-ake Persson Ab

Nils-Åke Persson

Klas Ralvert

The present invention relates to a filter panel () intended for a drum filter (), said filter panel () having multiple filter holes () wherein each filter hole () has a length L and a width W, wherein at least a substantial amount of the filter holes () has a length L which is at least 1.5 times the width W, wherein the filter panel () 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 () intended to be in contact with a filter cloth of the drum filter ().

Filter panel for drum filters

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

Bio-filter unit for a fish farming system

A filter plate (1) is described on which a filter cloth (4) is disposed across the whole top side and glued or welded to the outer sides, and which is used for filtering off particles from a liquid. The plate has a large number of apertures (2), each individual aperture area being at most 2.25 cm.sup.2. The total free open area of the plate is 70-90% of the total plate area and the thickness of the plate is at least 5 mm.

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Malmö, Sweden

Nils-Åke Persson