Generally, the active system pertains to the cooling and heating systems that are using mechanical ways to generate energy. When it comes to horticulture, an active system is also widely used in hydroponics. It defines any system that has movable parts. In hydroponics, the active system is the opposite of the passive system wherein no movable parts are involved.
“The ebb & flow system uses the active system through tentatively flooding the plants’ roots within a growing tray using a pump.”
“An active system is important in growing cannabis.”