Automatic self prime pressurization system with on/off mode. The system is designed for pressurization, gardening and irrigation in residential building service. The Active System is composed by a self-priming pumps: Active J with Jet with cast iron pump body, Active JI with JetInox with stainless steel pump body and Active EI with multi-impeller EuroInox with stainless steel pump body. The pumps are combined with an electronic device equipped with pressure switch and flow switch. Active System can also take water from wells, tanks or cisterns even in the presence of air bubbles or small sandy impurities. The electronic device allows the pump to be switched on and off automatically and limits start-ups to prevent the motor from being damaged. Protection against dry running included. Air-cooled motor.