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Concrete Biosand Filter

No change in size, 23:59, 14 May 2012
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[[Image:concrete biosand filter.pngjpg|thumb|right|250px| Bio Sand Filter in Kumbo, Cameroon. Photo: [http://www.lwdgc-africa.org/15.html LWDG Cameroon.]]]
[[Image:CAWST_Biosand.png|thumb|right|250px| Cross-section through a concrete biosand filter]]
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