A pool cleaning robot may include a housing that has a first fluid opening and a second fluid opening； a filter that comprises a filter core that is at least partially located within the housing and comprises an one or more inlets, an one or more outlets and at least one filtering element positioned between the one or more inlets and the an one or more outlets； and a filter core rotator that is arranged to rotate the filter core during at least one period in which the filter core filters fluid that enters through the one or more inlets to output filtered fluid via the one or more outlets.
