Stock Photo - 31 January 2022, Hessen, Mühlheim am Main: Ralf Rippe stands between the huge settling and filter basins through which contaminated groundwater is pumped around the clock. Every year, around 200 kilograms of arsenic are filtered out of the water in this way, which in past decades had found its way into the upper soil layers as industrial waste. Photo: Boris Roessler/dpa. - Mühlheim am Main/Hessen/Germany

Stock Photo: 31 January 2022, Hessen, Mühlheim am Main: Ralf Rippe stands between the huge settling and filter basins through which contaminated groundwater is pumped around.

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