File:Rapid sand filter EPA.jpg
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Date/Time | Dimensions | User | Comment | |
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current | 21:17, 24 March 2010 | 1,987 × 1,489 (430 KB) | Moreau1 | {{Information |Description={{en|1=Illustration (cutaway view) of rapid sand filter for water purification}} |Source=[http://nepis.epa.gov/Exe/ZyPURL.cgi?Dockey=300048WU.txt "Technologies for Upgrading Exist |
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