A dishwasher incorporates a primary filter cleaning system for removing food debris from circulated wash water. The dishwasher having a sump formed in the bottom and a wash pump having an inlet in communication with the sump. A collection chamber is formed through the bottom of the sump and a filter is situated over the top of the sump. The filter has an opening for depositing debris in the collection chamber. A stationary manifold is situated about the upper periphery of the sump and is aligned with the discharge of the pump. The manifold has multiple spaced spray nozzles, with each of the nozzles being aligned for spray contact with the filter. When water is pumped from the sump to the manifold, the water is sprayed across the filter to remove any food debris on the filter. The debris is then swept into the collection chamber.