Every year on 22 March, World Water Day reminds us of the importance of one of the most important resources of life. Almost two-thirds of our planet is covered with water, but not even 3% is drinkable freshwater. Every day, large quantities of chemicals enter our waters and endanger the health of humans, animals and plants. In addition to pesticides, for example, drug residues also pollute our drinking water. The Leibniz Institute for Plasma Science and Technology (INP) has developed technical solutions to clean wastewater of such pollutants.