27.03.2026, Germany, Berlin - View of a secondary clarifier at the Ruhleben sewage treatment plant. In the background the buildings of the flue gas cleaning and the chimney of the sewage sludge incineration can be seen. 00R260327D157CAROEX.JPG [MODEL RELEASE: NOT APPLICABLE, PROPERTY RELEASE: NO (c) caro images / Ruffer, http://www.caro-images.com, [email protected] - In case of using the picture for any purpose, please contact the agency - the picture is subject to royalty!]