My version of a homemade "biosand" water filter. This simple homemade water filter is large enough to treat drinking water for a small household. The filter is portable and made from commonly available materials. The filter media is sand and pea gravel. Solar disinfection can be used to disinfect the filtered water. As a result your off grid drinking water supply is never dependent on consumable items like fuel, electricity, chemicals, activated charcoal. For more information about "biosand" water filtration technology and a different design, check out this web address: www.cawst.org
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