CamelBak All Clear UV Microbiological Water Purifier
Cleaning water using ultraviolet light removes 99.99 percent of viruses, protozoa and other microscopic beasties you'd rather not ingest that most filters can't catch, and now you can do it on the go. (Chemical treatments also remove such things but take far longer.) CamelBak has incorporated UV into a lightweight one-liter bottle that lets you treat the water easily and quickly: Just fill it up, press a button, and in 80 seconds the LED screen indicates that you're ready to drink.
From $100; camelbak.com
ok... so this treats pretreated water, stream water or sewage? I doubt sewage but if it could work on stream water that would make hiking in AZ that much easier!
I would be curious to know as well for the same application. A google search reveals a bunch of outdoors sites with articles on the subject, but the only thing I could find is that it doesn't get rid of particulates, which is obvious already. I would guess that it probably would be OK for spring water.
Even though it was supposed to come out in Oct, Camelbak doesn't have it on their site. I would also be curious as to the battery life.