The Ebb & Gro (from 12 to 48+ plants) is the most versatile Ebb & Flow system on the market. With many growers going from large numbers of small plants to fewer, larger ones, the Ebb & Gro fits the bill! It is a simple system that uses 2 pumps and gravity to flood and drain the planters about 3 or 4 times a day. The fill drain cycles are controlled by the controller unit (the square white container) to control the feeding schedule that you set on it’s built-in timer. This system can be set up in many different sizes and shapes to fit your exact growing needs. You can add more grow pots as necessary. It is completely expandable.