Stock Photo - 12 October 2020, Hessen, Kassel: The waste water in the sedimentation basins has been drained due to renovation. ""Kasselwasser"" is a company owned by the city of Kassel with about 170 employees. The sewer network has a total length of 840 km. The wastewater is treated in a central sewage treatment plant. Photo: Andreas Arnold/dpa. - Kassel/Hessen/Germany

Stock Photo: 12 October 2020, Hessen, Kassel: The waste water in the sedimentation basins has been drained due to renovation. ""Kasselwasser"" is a company owned by the city.

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