The Hydro Critic’s Choice !Get the convenience of a dynamic Ebb & Flow system in a 22″x22″x10″ size garden. Ebb & Flow Systems work by pumping the nutrient solution up from a reservoir to a controlled water level tray. All plants are watered uniformly on a timed cycle. Grow up to 15 plants in this easy to use system. System includes; 7.5 gallon reservoir, insert grow tray, submersible pump, irrigation timer, starter cubes, water level indicator, growing medium, fifteen 5.5″ square planter, hydroponic nutrients, pH test kit, & Illustrated instructions.