Get the convenience of an Ebb AND Flow System in a 22" x 22" x 10" size 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 + Timer Seed Starter Cubes Water Level indicator Growing Medium + Fifteen 5.5" Square Planters Nutrient pH Test Kit Illustrated Instructions