Craig:
Truth be told, except when treating water overnight, I've never actually waited four hours (or even two) when I used Micropur. Like you and Mike, I am still very much alive. OTOH, there was always the nagging wondering while on the trail… hmmm… are any of the protozoa multiplying in my gut?
The tough thing about water treatment is that most of us will never really know:
1. If we didn't get sick, was that because of the efficacy of our water treatment? Why, lots of people don't treat their water at all and they do just fine.
2. If we do get sick, was that because our water treatment failed us? Or because we (or our buddies) didn't wash hands thoroughly enough?
I daresay that most all of us who use chemicals just do that "seat of the pants". But still, I am a bit taken back by Mike's very, very definitive statements. Can (or should) we really be that emphatic on methodologiesthat're really more art than science?

