An external docking station may be provided and may include a filter manipulator that is arranged to (i) input a filter into a pool cleaning robot that exited a pool and is located in a filter replacement position and to (ii) assist in positioning the filter at a filtering position in which the filter is at least partially disposed within a fluid path formed between a first fluid opening and a second fluid opening of the housing thereby allowing the filter to apply a filtering operation on fluid that passes through the fluid path.