a couple years ago I bought a bottle of it in a delusional moment, apparently, but was afraid to use it after reading more and getting a BAAAAD feeling about it. I still have it, since you're supposed to be able to purify water with it - my husband hoards a few things for "when the shit goes down." lol! Not exactly a survivalist, but I guess a case of rice and a few extra bottles of water make him feel better. I hope he's wrong, but I know he'd fare a lot better than me without air conditioning, a blow dryer and the internet. :)