An auxiliary gray water supply device captures used wash water from a commercial warewashing machine for supply to a pre-rinse station without substantial modification of the commercial warewashing machine. The captured wash water and treatment agent are delivered to a pre-rinse station for pre-rinsing of dishes that will be washed within the commercial warewashing machine.

Provided are a control method for a dishwasher and a dishwasher. The dishwasher includes a spray rod and a spray rod driver configured to drive the spray rod to rotate. The control method for the dishwasher includes acquiring a predetermined washing signal; controlling the spray rod driver to drive the spray rod to rotate into a predetermined washing region from a current position; and adjusting a parameter of sprayed fluid flow when the spray rod rotates into the predetermined washing region.

The present invention relates to a dishwasher, which allows a washing course to be changed to a low-noise course in real time with a simple operation by using a user terminal while the dishwasher is running, and to a method for controlling a washing course of the dishwasher. The dishwasher, according to embodiments of the present invention, may comprise: an input unit that receives a course change signal commanding to change to a low-noise course having a noise level lower than a noise level of a washing course; a storage unit storing, as data, the speed of a washing motor of the low-noise course corresponding to each washing stage of the washing course; and a control unit that, when the course change signal is input, recognizes the washing stage of the washing course, changes to the speed of the washing motor of the low-noise course corresponding to the recognized washing stage, and controls the washing stage of the low-noise course.

A dishwasher includes a tub, a sump, a wash pump, a rack, a nozzle disposed at a lower end of the rack, the nozzle being rotated by a force of wash water supplied from the wash pump and having a magnetic object coupled to one end of the nozzle so that a first pole and a second pole of the magnetic object face a rotation direction of the nozzle, a sensing module that senses a magnetic force generated by the magnetic object, and a controller receiving sensing results from the sensing module, and determining one or more of a rotation direction of the nozzle, a rotation speed of the nozzle, or whether the nozzle rotates, to output an abnormality notification to a user or control wash water supplied to the nozzle through the wash pump.

A conveyor warewasher for cleaning washware includes at least one washing zone at least one rinsing zone and a conveyor apparatus for conveying the washware therethrough. A camera system is arranged above or below or to the side of the conveyor apparatus and is configured to capture at least one image of an area of the conveyor apparatus. An evaluation device is configured to evaluate and determine on the basis of the classification performed whether, at the time of the image capture, at least one of the following categories of washware was present in the area of the conveyor apparatus: cutlery or pieces of cutlery; pots, pans, or GN containers; glasses, in particular drinking glasses; trays or tray-like objects; plates, cups, or bowls; utensils; other washware; mixed washware; plastic washware; or no washware.