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Germany's wastewater systems exported around the world

Vast water and sewage systems run underneath the German city of Bonn. This wastewater contains everything from dishsoap and shower gel to excrement and paint thinner. Filtering this water so it can be recycled into the tap is a monster task. But German wastewater technology is being copied and exported around the world.

Listen to audio 06:14

Report by Camille Grayson