System is used for the cleaning of metal grids which are placed at the water entrance area of pumping stations.It comprises a stainless steel "comb" which moves along the grids, removing materials accumulated in front of them. Removed materials are forwarded to a belt conveyor, through which are discharged to the end of pumping station.Belt conveyor, as long as hydraulic power pack and electrical board, are placed on a steel chassis which moves along the pumping station in order to serve all grids. All movements of the system are hydraulic.