>>I wonder if there would be any problems caused by introducing an iodine tablet to a water bag. Would the chemical weaken the bag or cause any undesireable chemical reaction with the various plastics of these different bags (oven, ziplock, mylar, condom, platypus, etc)? Normally the tablet sinks to the bottom and takes a while to dissolve. The point where the tablet contacts the container would have a high concentration of iodine for a while. Doug's article on alternate containers for Potable Aqua tablets illustrates how corrosive these tablets can be to many materials…. If anyone has done any testing like this or has a knowledge of chemistry, please let us know!<<<br><br>Seems like a valid question, and nobody’s jumped on it. Almost all of my old Austrian polyethylene bottles from the old backpacking days when we routinely used iodine instead of filtering are permanently stained with a reddish tint- may not be detrimental, but it does show that the material is not impervious.<br><br>I’m willing to do the testing if no one beats me to it. Might take awhile to get my ducks in a row- I don’t want to use my current stock of Potable Aqua tablets, but don’t mind buying more- when I get to someplace that sells them. I had concerns about bags freezing outside, but there’s a laundry tub in the basement. I’ll test one or two types of zip-lock bags, the oven bags, and maybe even a condom- though I think I’d better explain that purchase to a certain lady in advance…