The jury is out. It has been used in municipal water systems in Europe and supposedly beats fllourine and is on a par with chlorine (I'm skeptical). Thing is, nothing I've read (except for the article cited above) talks about it in terms of survival stuff, eg, one liter/gallon at a time. We all know iodine and chlorine works. Why mess around? I guess its better than nothing, but I'm confident with four drops of iodine per liter. On that note, you can get a nice purifier for less than $100 (I like the MSR mini-works at around $80). I'd go that route if you camp and will use it anyway, and aren't just looking for a survival situation. If you don't, a bottle of iodine or iodine tablets is sure easy and proven.