I remember those bottles and the wax- the wax got soft and sticky and all over everything when it got really hot.<br><br>I doubt that it would make much difference. Once upon a time I used part of one of those jars, sealed it and put it away- in a couple of year's time, even though it had been closed the whole time, the remaining tablets had "bloomed" into a fuzzy mess. Very hydroscopic.<br><br>The current commercial versions, at least Potable Aqua, don't seem to do that.. so I'm guessing that they have a very thin coating of something to make them more resistant to humidity.