Abstract: An indicator providing a visual indication of the level within a rinse aid dispenser tank for dishwashers, consisting of a U-tube containing an indicator liquid having one leg in communication with the lowermost region of the tank and with the other disposed adjacent a viewing window. Air pressure generated in the connecting tubing by the relative liquid level in the tank acts to control the position of the liquid in the U-tube to provide a level indication at the viewing window. The air column intermediate the tank and the U-tube section is vented each time the door is opened to avoid variations in indication occurring with temperature and atmospheric pressure changes. The indicator liquid is introduced through a fill and drain tube extending from the upper end of the leg into the dispenser tank, such that a calibrated volume of liquid is introduced by flow into the U-tube from the tank and drain back of the excess over the calibrated volume.

Abstract: A method of cleaning dishes, utilizing a dishwasher apparatus connected to both hot and cold-water lines, the method includes: beginning with one or more cold-water pre-rinses, then providing a hot-water wash, and, finally, concluding with one or more cold-water post-rinses and a last hot-water rinse. Drying then follows with air being circulated through the dishwasher wash chamber. The drying is aided by the residual heat of the dishes from the last rinse.