Towards the end of the stay in San José, Dr. Stefan and Dr. Caucci were invited to give a lecture at the School of Health Technologies of the University of Costa Rica. The lectures were attended by students and members of staff who were introduced by Dr. Stefan to the general concept of managed aquifer recharge and its role in the hydrological cycle. Dr. Caucci’s talk was on environmental sanitation, a very actual and relevant topic for the audience.