Today, over 1,000 kilometers of pipes, more than 90 retention basins and two modern sewage treatment plants ensure that Osnabrück's rainwater and wastewater can flow cleanly into the Hase and Düte rivers. But how does the complex process of wastewater treatment work? The employees at the Eversburg sewage treatment plant explain the difference between biological and mechanical treatment and show which hygiene products pose new challenges for sewage treatment plants.  

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