Abstract: The present invention is to provide a sump assembly which enables leaked washing water therein to be circulated smoothly without remaining therein, and a dishwasher using the same cleanly and sanitarily. For this, the present invention includes a sump housing for holding washing water; an impeller housing secured to the sump housing for placing an impeller pumping the washing water therein; a filter housing provided on an upper portion of the impeller housing for placing a filter filtering the washing water therein; and a connection device for making a lower portion of the filter housing in communication with the sump housing. Owing to the above configuration, the dishwasher may be used cleanly and sanitarily, resulting in enhancing washing efficiency and endurance of a product.

Abstract: A dishwasher and assembly method thereof are disclosed, by which an overall height of the dishwasher is reduced, by which water can stably flow and by which assembly efficiency can be enhanced. The present invention includes a sump accommodating water therein and a wash pump assembled to the sump in a lateral direction to circulate the water within the sump.

Abstract: A dish washer includes a sump communicated with a tub to accommodate water, a water supply pump for pumping the water in the sump, a filtering device for receiving a part of the water pumped through an auxiliary passageway to filter the pumped water and to supply the filtered water to the sump again, and a bypass for bypassing the water to be supplied to the filtering device to the tub or the sump when the filtering device is blocked by sewage. The bypass includes a first sensor detecting water passing therethrough and the filtering device being blocked and transmitting the detected result to a controller, and a second sensor detecting and informing the water pollution level to the controller when the filtering device is blocked. A controlling method thereof determines an algorithm of a cycle for washing or rinsing dishes using information acquired from the first and the second sensors.