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Amazon.com : Katadyn BeFree 1.0L Water Filter, Fast Flow, 0.1 Micron EZ Clean Membrane for Endurance Sports, Camping and Backpacking, One Size, 8018006 : Sports & Outdoors
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File:Katadyn BeFree Water Bottle 0.1-micron Hollow Fiber Filter (42691095220).jpg - Wikimedia Commons
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