Active Aqua Grow Flow Ebb and Gro Controller Unit w/2 PumpsEach Grow Flow Controller Unit can control up to 24 of our 5 gallon growing modules, and up to 48 2 gallon modules. Includes one 7 gallon controller bucket, premium Grasslin timer, two 250 GPH pumps, all fittings, 1 2" tubing for pumps, and sample nutrients. Emergency shut off valve provides fail safe overflow protection Adjustable ladder level control lets you fill containers to the desired height Heavy duty float switches dictate when and where