Roughing filters provide pretreatment for
External links
[http://www.sandec.ch/WaterTreatment/WT_RoughingFilter.htm SANDEC page] [http://www.bluefuturefilters.com/rough.html Blue filter Inc.] (commercial site) [http://wedc.lboro.ac.uk/conferences/pdfs/23/Deshpand.pdf Rejuvenation of SSF using HRF technique]
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