I don't know if heat makes the chlorine dispel quicker. I don't know how much chlorine is considered potable. That's research everyone is going to need to do, since I won't. I don't have a swimming pool. If I get one then I'll do the math. Test strips would be a good suggestion to own. Absolutely, in a situation where nobody is looking after the water supply, I would depend on my own purification. Good filter plus boiling does it for me. If the only available wild water is yucky, then several filtrations, boiling and some chlorine too. I do live in an area where water availability could become the number one problem.