Hey paramedicpete,<blockquote><font size=1>In reply to:</font><hr><p>Also don't forget where there is no water, i.e. the lip of the container, sterilization does not occur.<p><hr></blockquote><p>Are you sure? Light travels just fine through air. Why would the presence or absence of water make any difference? The inner lip of the container would be exposed to UV light, just like the water in the container, and, after you zap the water, you could just zap a second time and run the pen around the outer lip of the glass, couldn't you?