I have to say that these bottles kick thirsts butt. I am on my second version of the filter bottle. I got the smaller of the 2 Katadyn models. IMO ... get the larger one, as the filter displaces about 1/3 the volume in the smaller bottle. If the water I am about to scoop is total S&%t, iodine tablets can be used to pretreat the water. The filter does a great job of removing that tablet taste. This bottle has followed me all over the world. It's great for traveling in other countries and for a Sunday hike w/ the wife and kid. As stated, I would not use this for the lower Animas, Uncompadre or any other river that had mass mine tailing piles near it.
Claimer: Someone that makes a claim that they have been there and done that, can do anything you can do better than you. I hate "claimers"