Peace has had good success with silver impregnated filters to make potable water in some pretty nasty water supply areas in third world countries. NASA and the Russian space agency use silver on the Space Station too. And silver water purification is quite successful in non-chemical home swimming pool water purification. Even so, you're probably right given your wilderness scenarios. The ability to measure the amount of chlorine dioxide needed is a definite plus and getting rid of the odor would be a plus too and I am not sure how much the silver would dissipate such odors - though they are caused by bacteria and silver is deadly on bacteria. I do not have any wilderness adventures planned in the future, but I would be comfortable with one of the wilderness filtration units and colloidal silver in most instances. And if I somehow caught a bug, then I would still have the silver to knock it out. I use a VERY good silver product.