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Title: Worked great first time out
Review: Recently purchased, and just used on a Mt Whitney climb. Worked great. Easy to use and fills up containers fast. I used with both Nalgene bottles and a water bladder. As you can see in the picture the output cap can fit multiple sizes. As others noted, just follow the directions for first time use, cleaning, and long term storage. I have not used the chlorine-based SweetWater Purifier Solution yet, and may not need to in the U.S. (unless the source is really questionable).
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