So a few weeks ago I was sitting around talking gear with my uncles who does a lot of hunting/hiking and he was telling me about a water filter one of his hunting buddies uses. He said that they used it at a cow pond out in the middle of the Arizona desert and were able to get clean, crystal clear, fresh tasting water. He couldn't recall the brand of it, anyone know about this??? I've never heard of a backpacking water filter being capable of cleaning such foul water. I know for a fact my Katadyn filter won't do it. Anyone have any thoughts on this???