Purify 128,000 gallons for $10

Lol, I just watched the vid. Obviously, I didn't watch it before my last post. hmmm, not all of the info he says is correct. CaClO2 isn't exactly bleach. It's a salt (bleach is also a salt), and extremely similar, and reacts the same, but it's not bleach. It's pool shock (like he says), and is probably safer to use than NaClO as it leaves calcium in the water instead of sodium. It's only the chlorine and oxygen that evaporates as I understand the reaction. Both would work though.

Mixing NaClO in water to shock it would take less NaClO and it would taste like crap afterwards, but if not consumed in large quantities it would get you by in a pinch. I wouldn't do it as a long term solution though. CaClO stored as a solid is going to keep a hell of a lot longer like he mentions too.

What he doesn't mention is you are going to get residual Chlorine from this method (you would from both). It going to taste like pool water and have a slipperly feeling like pool water. Chlorine isn't the best thing for the human body. I think this method would work though until one could set up a solar still or water distillery, but both of those methods are going to render safer long term water source. Hell, collected rain water is really good stuff as long as the atmosphere isn't contaminated with anything. Nitrogen and radioactive fall-out are probably the things you would have to worry about floating around in the atmosphere that would cause problems with rain water after the SHTF. Nitrogen mixed into rain water is what causes acid rain. It turns into nitrous acid (H2O (l) + N (s) --> HNO2 (l)). Distilling this would render it safe to drink though.