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Biosand Filters: Low-cost, Low-maintenance Water Filtration System

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It's estimated that contaminated water accounts for more than half of the diseases and deaths in third-world countries.  One of the most low-cost, low-maintenance methods of water filtration is the biosand filter system.  There are many variants of this system.  Here is one: http://www.cawst.org/en/resources/biosand-filter


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