Wow, the things you learn on this forum!<br>I never knew that Auqatabs were not EPA approved. We've been using that stuff in the Army for years to purify water (yeah it tastes like crud, Iodine is the better flavour!!). The first time I heard of iodine based water purification was on this site and was wondering why no chlorine based tabs were being used. Now I know the reason.<br>Time to do more research on the web......