Patent ID: 8404118

Claim:
A filter unit for filtering a liquid, said filter unit comprising at least one dead end filter element made of a permeable material for filtering a liquid, which at least one dead end filter element comprising a top end, a bottom end and a plurality of substantially parallel arranged channels comprising a first end and a second end, which plurality of substantially parallel arranged channels being separated by walls of said permeable material, wherein the end of a first group of said channels are blocked at said top end of said dead end filter element and open at said bottom end of said dead end filter element, and the end of a second group of said channels are blocked at said bottom end of said dead end filter element and open in said top end of said dead end filter element, wherein said at least one dead end filter element is arranged so that the longitudinal axis of said channels are kept in an angle between 10° and 170° compared to horizontal, such as between 30° and 150°, preferred between 70° and 110° such as around 90°, and wherein said filter unit comprises a flow driving arrangement for providing a fluid flux from the openings of the channels comprising open ends at the top end of said at least one dead end filter element, into the channels comprising open ends at the top end of said at least one dead end filter element, through the walls of permeable material to the channels comprising open ends at the bottom end of said at least one dead end filter element, and out of the open ends at the bottom end of the at least one dead end filter element.