#coneixelquellences, the messaging system via WhatsApp, Telegram or SMS of the LIFE REthinkWASTE project, based on the concept of Know-as-you-throw (KAYT) for the improvement of waste separate collection, has been operating in Sant Just Desvern for almost a year. In these videos, the Mayor, the Councillor, technicians involved in the project, and residents of Sant Just Desvern give their opinion on this initiative.