US Patent 7588038 Sump assembly for dishwasher

Sump assembly for a dishwasher holds washing water and supplies the washing water to spray nozzles. The sump assembly includes a sump housing for holding washing water, a pump provided to the sump housing for pumping the washing water, and a soil chamber housing for receiving a specified amount of the pumped washing water, wherein a sensor assembly is provided to the soil chamber housing for measuring a level of contamination of the received washing water.