File:Slow sand filter EPA.jpg

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	03:57, 28 March 2010		2,115 × 1,187 (189 KB)	Moreau1	== Summary == {{Information \|Description={{en\|1=Diagram of a housed slow sand filter for water purification}} \|Source=[http://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=300048WU.txt "Technologies for Upgrading Exis

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