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4 This induced bank filtration plant in Mainz, Germany, draws water from the Rhine River and pulls it through the ground to cleanse it. Photo courtesy of Wikimedia Public Domain.jpg

4 This induced bank filtration plant in Mainz, Germany, draws water from the Rhine River and pulls it through the ground to cleanse it. Photo courtesy of Wikimedia Public Domain.jpg

This induced bank filtration plant in Mainz, Germany, draws water from the Rhine River and pulls it through the ground to cleanse it. Photo courtesy of Wikimedia  Public Domain