How's it goin, eh?
You may want to use Micropur MP1 from Katadyn instead of Potable Aqua. They are supposed to be better, but I will leave the research to you. Perhaps our forum mates have some info on this. As far as TinFu ( an exellent new term) is concerned, I have stuffed my psk, opened it, and been unable to repack it even though I know everything has previously been in it.