Patent ID: 7662279

Claim:
A filtering device, in particular for fish basins, comprising a housing ( 10 ) encompassing a filter chamber ( 20 ) and a filter drum ( 30 ), which is rotatably disposed in the filter chamber ( 20 ) and is loadable with water to be purified, about which a filter belt ( 40 ) is guided along part of its circumference from a dispensing roller ( 42 ) to a receiving roller ( 41 ) that is driven by a paddle wheel ( 50 ) disposed outside the filter chamber ( 20 ), whose paddles ( 51 ) are activated by unpurified water that flows over an overflow when an increasing degree of dirtying of the filter belt results in a rising water level in the filter chamber, in such a way that the filter belt ( 40 ) is wound from the dispensing roller ( 42 ) onto the receiving roller ( 41 ).