Well, I've gone from a PUR filter (now Katadyn) to Katadyn chlorine dioxide tablets and now I'm going to a SteriPen UV treatment W/ chlorine dioxide tabs as a back-up.

To me chlorine dioxide tabs are far too slow. UV treatment is much faster even with several bottles being used to fill a hydration bag.

Conversely, UV treatment can be used for one or two bottles for immediate use and Chlorine dioxide tabs for a hydration bladder to be used in an hour ot two after treatment. Either way I think we'll be carrying both methods of treatment if we're smart.

Eric