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When washing hands in public restroom, people would get bothered by the fact that their hands could be recontaminated after washing by touching the switch of the tap with liquid soap on it. Sensor switch is helpful yet sometimes insensitive.
When using Pull & Flow tap, the switch will be washed by the delayed water flow when the tap is off, thus the switch will stay clean after use.
Qingdao University of Sci. & Tech.
Jiangbo Liu Yanna Zhang Yapeng Zhang Zheng Wang