Active Aqua Grow Flow Ebb and Gro Controller Unit with 2 PumpsDescription Grow Flow Controller Unit: This unit can control up to 24 of our 5 gallon growing modules, and up to 48 2 gallon modules. It includes a 7 gallon controller bucket, a top quality timer, two 250 GPH pumps, all fittings, 1 2" tubing for the pumps, and sample nutrients. Emergency Shut Off Valve: This feature provides fail safe overflow protection. Adjustable Ladder Level Control: This allows you to fill containers to your desired height. Heavy