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Rain water harvesting Biosand water filter slow sand water filter
Slow Sand Filtration for Water Treatment
Biosandfilter.org - The Biosand Filter
Sand filter - Wikipedia, the free encyclopedia
http://whqlibdoc.who.int/publications/9241540370.pdf This is a 120 page pdf give it time to download.
http://www.nesc.wvu.edu/ndwc/pdf/OT/TB/TB14_slowsand.pdf
Slow Sand Filtration for Water Treatment
Biosandfilter.org - The Biosand Filter
Sand filter - Wikipedia, the free encyclopedia
http://whqlibdoc.who.int/publications/9241540370.pdf This is a 120 page pdf give it time to download.
http://www.nesc.wvu.edu/ndwc/pdf/OT/TB/TB14_slowsand.pdf