sotto,
What type of tablets are you using? I thiought that I had the problem solved a while back by placing my Potable Aqua tabs into sealed plastic straws ... alas it was not to be. Still unsure if I had a bad seal or if there were other issues. Since then, I acquired several small vials and as yet, haven't had a repeat.
Please keep an eye on your Saran wrapped tabs until you're sure that they won't allow the tabs to corrode your PSK etc. Good luck and let us know. <img src="images/graemlins/smile.gif" alt="" />