Description: Public Domain Source httpscommonswikimediaorgwikiFileActivatedSludge1svg
By: Magirly
Date: 2013-08-28
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Downloads: 109
Filesize: 5597
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Activated Sludge 1 sourced from Openclipart is licensed under CC0 1.0
* Note: Date might not match original source and might be an educated guess.