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  1. Disaster Preparedness General Discussion
    Slow sand and Biosand water filter, concepts and execution and alternative http://en.wikipedia.org/wiki/Slow_sand_filter and alternative http://en.wikipedia.org/wiki/BioSand_Filter 1. conceptual 2. Slow Sand filter (.25 GPM) in 5 gal. bucket; Base camp or family size with backflush...
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