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Upflow roughing filter

212 bytes added, 22:52, 18 September 2012

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[[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.]]]

[[Image:roughing filter chart.jpg|thumb|right|300px|Sunderbans Water Filtration Unit, West Bengal. Photo: [http://www.wherevertheneed.org.in/projects/indian-projects/sunderbans-water-unit/ Wherevertheneed.org]]]

Roughing filters are often used to pretreat water by removing suspended solids from the water that could rapidly clog a slow sand filter. Roughing filters can also considerably reduce the number of pathogens in the water, as well as the amount of iron and manganese. There are many types of roughing filters with different flow directions (downflow, upflow and horizontal flow filters), and with different types of filter medium (e.g. sand, gravel, coconut husk fibre). Upflow roughing filters are relatively cheap and easier to clean than downflow or horizontal flow filters.

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