About a decade ago it became known that pharmaceutical residue in river water had caused fish to change sex. Recent studies show that pharmaceutical residue alters behavior of perch. Many studies have concluded that waste waster contains micro pollutants like pharmaceutical residue. This water is released from our waste water treatment plants into the environment without proper treatment. Many countries in Europe are now taking political action to reduce the effects of the pharmaceutical residue. In Switzerland, for example, political decision will force 100 sewage plants to be equipped with systems to remove pharmaceutical residue.
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