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Biosand filter

95 bytes added, 21:25, 14 April 2009
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* Organisation [http://biosandfilter.org/biosandfilter/ http://biosandfilter.org/biosandfilter/]
* Organisation [http://turnonthetap.ca Samaritan's Purse Canada - Turn on the Tap]
* [http://www.cawst.org/assets/File/BSF_Literature_Brief.pdf Scientific studies on biofilters]
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