... operated draining system up to the bottom of the drain pipe(residual water will turn stink overnight).3.water level sensor, ... .this cleaning machine is not the ordinary ozone sterilizing system. it uses uvo3 that its sterilizing power is 2 ... , located in Ningbo City, China.Our different products includes water purifier, air purifier , vegetable /fruit ozone sterilizer, tooth brush sterilizer, electronic ...