flow meaning: 1. (especially of liquids, gases, or electricity) to move in one direction, especially continuously…. Learn more.
A good rule of thumb for watering in an ebb flow system is to water just long enough to completely flood your tray or pot with nutrient solution and then let the system drain. Most readily available timers have 30 minute increments so you may have to flood the tray for a little longer than it takes to reach the overflow level.