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* [http://www.raintree-foundation.org/AT/Appropirate_Technologies/Bio_Sand_Filter.html Biosand Filter]
 
* [http://www.raintree-foundation.org/AT/Appropirate_Technologies/Bio_Sand_Filter.html Biosand Filter]
   −
[[Category:Water_treatment]]  
+
[[Category:Water filtration]]  
 
[[Category:Filters]]
 
[[Category:Filters]]
[[Category:Liquid filtration]]
 

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