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Upflow roughing filter

346 bytes added, 23:01, 18 September 2012

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[[Image:Icon_biosand.png|right]]

[[Image:roughing filter 2.jpg|thumb|right|300px|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|300px|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]]] 

[[Image:upflow roughing filter.jpg|thumb|right|300px|Upflow roughing filter. <br>Photo: WHO.]]

[[Image:roughing filter chart.jpg|thumb|right|300px|Filter Classification. Chart: [http://www.greenstone.org/greenstone3/nzdl?a=d&c=hdl&d=HASH01ccfcc122c3ed3492c9f50c.6.1&sib=1&p.a=b&p.sa=&p.s=ClassifierBrowse&p.c=hdl SANDEC.]]]

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