[quote=falcon5000 I wonder if the micropur tablets in time may have to be replaced if not used in a long time (like a shelf life), I'm not sure though, I know Iodine lasted for years but doesn't kill the good stuff. [/quote]

Here's an email I got from Katadyn when I had the same question a few months ago.... The tablets I own have a 2012 expiration date...

" The tablets may last longer however since the product hasn't been around for say 6 years the company would not have the data in order to test.

Regards,

***** ******/ Customer Service
Katadyn North America
6325 Sandburg Rd Suite 400
Minneapolis, MN 55427
Phone- 800-755-6701 or 763-746-3506
Fax- 763-746-3540 "