Hydroponic Grow System Tower with Three 12 inch Mrs. Stacky Trays holding 4 small plants each (a total of 12 plant sites). It works best with lettuce, herbs and other small plants. It Includes Hydroton Clay Pebbles Hydroponic Grow Media and 12 Rockwall cubes. It has a Quiet Ebb and Flow pump inside the 3.5 Gallon Hydroponic Water Reserve Bucket that only needs to run 5 minutes once or twice a day for effective moisture level. Adjustable PVC pipe allows for growing just one 1 tray or all 3 trays depending upon the size of the plants you are growing. Used, Good Condition and works great.