Abstract: A dishwashing machine comprises a washing tank closed by a lid and containing a removable utensils basket, and also comprising rotary spray arms with nozzles, which arms are mounted rotatably within the washing tank and fed by a hydraulic circuit. The washing tank has an open discharge port on its base and the fluid circuit comprises a delivery line for water under pressure which empties into a mixing chamber connected by tubes to the spray arms. The delivery line of at least one pump aspirating from a washing additive reservoir also empties into the mixing chamber.