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Biosand filter

43 bytes added, 16:09, 23 March 2009

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== Movie ==

* How the BioSand Filter Works [http://www.youtube.com/watch?v=hb0xf3mRbJM http://www.youtube.com/watch?v=hb0xf3mRbJM]

* Health and filters [http://www.youtube.com/watch?v=LPAWuws7qMM&feature=related

* Demo [http://www.youtube.com/watch?v=9Cj4yO4nLLY&feature=related www.youtube.com/watch?v=9Cj4yO4nLLY&feature=related ]

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