Convenience and versatility in a 22 in. x 22 in. x 10 in. garden. Ebb and Flow systems work by pumping nutrient solution up from a reservoir to a controlled water level tray. All plants are watered uniformly on a timed cycle. System includes 7.5 gallon reservoir, insert grow tray, submersible pump and timer, seed starter cubes, growing medium and 5 planters, Hydrofarm nutrient + pH test kit, illustrated instructions, and a water level indicator.