Bleach will kill the cyst based pathogens, but it takes time. Warmer water and highly filtered (little organic matter) will help with that. I don't recall anywhere on here where Chlorine Bleach doesn't take care of the same things. Bleach just isn't something that's easy to pack into a kit, and it loses potency over time rather quickly.

I was thinking that having to have battery plus salt (two consumables) for this tool was a negative, but shelf life changes that assessment. I think this would make a great addition to a BOB, but you have to remember that it can't filter toxic water. In a long term survival situation, getting salt and batteries might be easier than procuring bleach and keeping it stable. Plus, it's much less dangerous to handle salt. <img src="/images/graemlins/smile.gif" alt="" />