A good result in extinguishing can only be achieved when the training have been successful for extinguishing systems, firefighting foams and the fire brigades in charge of extinguishing the fire. A good training foam has to be useful in all types of waters as well as all types of systems (fog-stream, low/mid/high expansion, etc.). These foams have to control and extinguish the fires (not only producing foam) as the firefighters have to be ready to control and extinguish, not only applying foam per se. On the other hand, the foam should not have a great resistance value in terms of reignition, in order to make easier consecutive trainings and also having a very low environmental impact.