This thread, because of its health importance, has garnered a lot of attention.
Recently I e-mailed SteriPen asking them if a bottle covered with Mylar reflective film would help the sterilization process. No answer yet. I think, based on direct observation, that we all know SOME UV rays pass thru Lexan & other clear plastics. Otherwise we would not see the purple light of the SteriPen's lamp. Correct?
So, reflecting that light back may help to kill bacteria & viruses "hiding" behind & within micro particles of debris. SteriPen requires swirling the water to give the UV rays a chance to kill any "hiding" microorganisms.
Any SCIENTIFIC info out there to support my "reflectivity theory"? (i.e. tests that can be replicated many times by different investigators with the same results.)
Yes, there are articles mentioning reflection of the sun's rays to enhance the UV sterilization process. I have not seen reflection used within the actual water container, but I've seen it suggested to place your water container on a metal roof, white sand, light colored rock, or any other reflective surface you can find. Just like a mirror behind a candle will multiply the light output, so does a shinny surface multiply, at least some, the sun's UV.. I carry a rolled up sheet of aluminum foil to use under my bottles in camp on cloudy days. I also shake the bottle at least once during the UV process. Maybe we should start a post in which we discuss in detail our process of gathering and sterilizing our drinking water in the field. Brum