Active Aqua’s Grow Flow System is the most efficient ebb & flow system on the market. With the Grow Flow’s easy-to-program controller unit, you can pretty much "set it and forget it." And since your pumps are only pumping a short time each day, the system is extremely reliable and efficient. Just set the fill and drain cycles, and the controller unit does the rest! As for safety, the Grow Flow is the only unit available with fail-safe overflow protection. If the float valve stops operating, the LED indicator lights up on the control panel and the emergency shut-off valve automatically shuts down the system, preventing any spillage or damage to your growing area. Have bigger plans? Expand the Active Aqua Grow Flow System with the convenient Grow Flow Expansion Kits. You can connect up to 24 growing modules to a single 5-gallon system – and up to 48 modules with the 2-gallon system! You can also build your own system from the ground up by purchasing all the components individually. The Grow Flow System truly has everything you need to get started, right down to the fittings and tubing. Also included is a (1) quart bottle of each FloraMicro, FloraGro, and FloraBloom. They are the original Building-Block Nutrient System, often imitated but never duplicated. Flora Series contains complete Primary, Secondary and Micro Nutrients for enhanced yields and better crop quality. Users can adjust mixtures to suit specific plant needs. Flora Series enhances flavor, nutrition, aroma, potency, and essential oils in both hydroponic and soil cultivated plants. Flora Series contains highly purified concentrates for maximum solubility and pH balanced for ease of use. Known throughout the world as the industry standard, NASA and Antarctic Research Scientists choose Flora Series because of its superior formulation and reliability.