A drum filter for ponds comprises a filter material (10), a housing for the filter, and a motor for the drum (8). The material that is retained by the filter is removed using a cleansing unit (18). The drum is closed at the end, and liquid is supplied and removed via axial connections. The liquid flows through the filter drum from the outside inwards. The cleansing unit consists of a brush. A container for the material is located inside the drum, and the cleansing unit has a spray.
