Just to clarify, in case of confusion.....Aqua Mira = Chlorine Dioxide
And in general chlorine is rather ineffective at killing the cysts of protozoa, hence the occasional outbreaks in swimming pools (the perils of baby poop).
In reality, if your jugs are completely dry and not used for a couple weeks than there should little to no chance of protozoan cyst survival. Add that to the fact there is little evidence that infections are coming from backcountry water itself (many systematic reviews hint at user-to-user transmission from a previously infected individual) and a little caution likely is all that is needed. I am knowingly extra cautious having had giardia 15 years ago, having a friend that got it during a visit it Utah that included a river trip, and knowing cows infest most of the rivers I raft. Would likely be less concerned with some of the side drainages in ID but I have no doubt that there is some level of biological pollution in Deso's side streams. $12 a year for some peace of mind is a cheap, though possibly unnecessary, investment for me now. It only takes getting giardiasis once to not want that experience again or to force others to deal with those horrendous sulfur farts. Nasty. Not to mention losing 25-35 pounds isn't as pleasant as it sounds.