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Upflow roughing filter

1 byte removed, 02:11, 17 January 2014

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[[Image:~~Icon_biosand~~upflow icon.png|right|80px]]

[[Image:roughing filter 2.jpg|thumb|right|200px|Horizontal roughing filter with slow-sand filtration. Sunderbans Water Filtration Unit, West Bengal. Photo: [http://www.wherevertheneed.org.in/projects/indian-projects/sunderbans-water-unit/ Wherevertheneed.org]]]

[[Image:roughing filter 3.jpg|thumb|right|200px|Horizontal roughing filter with slow-sand filtration. Water passes through the different filter beds before it is ready to drink. Photo: [http://www.wherevertheneed.org.in/projects/indian-projects/sunderbans-water-unit/ Wherevertheneed.org]]]

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