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They work for most bugs excepting viruses, but like any filter, they clog fast if you don't pre-strain. They don't last long if you drink straight from the water source, like in the photos. Pretty good deal for the money though.
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I'd rather wake up in the middle of nowhere, than in any city on Earth. -Steve McQueen
Last edited by Barbarian; 10-16-2013 at 09:10.
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