This is my first post, though I've been lurking for a long time. I just wanted to thank everyone for sharing so much useful information.

And now for something related to the site other than my fawning appreciation: I found some individual foil packed Katadyn Chlorine purification tablets that seem great for a PSK. They were expensive, but it had been a missing part of my PSK, so I popped for it. Anyone know if these work well?