| Guardian Liberty Voice Sapwood from a tree branch can be used to filter over 99 percent of E.coli from drinking water, according to the latest findings by MIT mechanical engineers, and this low-cost method of water filtration may prove to be a boon to developing countries. Sapwood, Naturally Occurring Low-Cost Water FilterNews Tonight Africa MIT Researchers Find Sapwood Branch As Effective Water PurifierThe Almagest Tree Branches Make Very Effective Improvised Water Filters, Research FindsPlanetSave.com The Escapist –Design & Trend –The Epoch Times all 46 news articles |
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