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== External links ==
 
== External links ==
   −
* [http://www.raintree-foundation.org/AT/Appropirate_Technologies/Bio_Sand_Filter.html Biosand Filter]
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* [http://web.archive.org/web/20170721034041/http://www.raintree-foundation.org/AT/Appropirate_Technologies/Bio_Sand_Filter.html Biosand Filter]
 
* [http://www.wcponline.com/pdf/October2012Kearns.pdf] Sustainable Decentralized Water Treatment for Rural and Developing Communities Using Locally Generated Biochar Adsorbents (879kb pdf)
 
* [http://www.wcponline.com/pdf/October2012Kearns.pdf] Sustainable Decentralized Water Treatment for Rural and Developing Communities Using Locally Generated Biochar Adsorbents (879kb pdf)
    
[[Category:Water filtration]]
 
[[Category:Water filtration]]
 
[[Category:Filters]]
 
[[Category:Filters]]
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