Students of 4º ESO of the Atalaya School visited the Chemical & Biomolecular Engineering Department. Elena Manteca and Gema Pérez welcomed them and organized two experimental activities that students developed during the whole morning, last May 17th, 2019. One experiment activity consisted on the removal of cupper from a wastewater sample by applying ion exchange technology. In the second experiment the students experimented the chromatographic separation principles by doing an experiment using cromatography paper and also they watched how an ion cromatograph works.