Ebb and Flow Hydroponics
Ebb and Flow hydroponics systems hold your plants in a tray filled with growing medium - it sits above the reservoir holding the nutrient solution.
A timer starts the pump to fill the tray with nutrient solution to drench the roots, then it drains back down into the reservoir. This keeps the growing medium regularly flushed with nutrient and air to help your plants thrive.
Ebb and Flow hydroponics is also known as Flood and Drain hydroponics.