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Claude Needham
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Have posted a table-top demo on Xxaxx.com www.xxaxx.com/2013/03/pushing-the-jamb/

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This youtube video demonstrates the inner workings of a very low tech water filtration that is changing the lives of people around the world. The construction is simple, but the inner workings are handled by a self-contained ecology. Brought to you by the Canadians. How the BioSand Water Filter works - Samaritan's Purse CANADA
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