Elena Manteca and Gema Pérez organized a workshop on wastewater treatment in the IES Ría del Carmen (Muriedas) on February 17th, 2020. During the workshop, students received a short introduction about chemical Engineering followed by an experimental demonstration on the application of ion exchange technology for water treatment in order to reduce its cupper content to the safe disposal limits. Through this activity, we want to motivate secondary students to continue studying to become the chemical engineering professionals of the future.