Dishwasher wherein liquid is circulated with granules and separation device for separating granules from the liquid

Heavy-duty dishwasher for washing with granules heavier than liquid, comprising a washing chamber, a spray device for spraying washing liquid against articles to be washed in the washing chamber, a tank which is joined to an outlet opening from the washing chamber, a circulation pump having a suction side joined to a bottom outlet from the tank and a pressure side joined to means for conducting liquid sucked in from the tank to the spray device, and a dividing wall defining an upwardly open tank chamber for storing granules heavier than liquid in the tank, said dividing wall having an upper end disposed beneath the upper limit of the tank, and the outlet opening of the washing chamber being disposed above the tank chamber defined by the dividing wall, said dividing wall at its lower end comprising a portion pivotable between a first position in which the tank chamber defined by the wall is closed at its lower end, and a second position in which the lower portion of the tank chamber is in communication with the rest of the tank, said lower portion of the tank being tapered to the bottom outlet, and said lower end of the dividing wall being located spaced laterally from and higher than the bottom outlet.