The Active Aqua Grow Flow Controller is the most efficient ebb and flow system on the market. Through this customizable growing system, you can set up an indoor garden that fits your needs and space requirements, as well as modify it at any time by adding or removing buckets. The Grow Flow is the only system on the market with fail-safe overflow protection, meaning that if your float valves ever stop functioning, the emergency failsafe upper float switch will immediately power down the system eliminating flooding or damage to plants and the grow area. The startup kit includes a built-in timer, 7 gallon controller, 55 gallon main reservoir, two 250 GPH submersible pumps, 12 buckets, fittings, and instructions. The Active Aqua controller system can expand to up to 48 buckets. To find a Hydrofarm Authorized Retailer near you, visit Hydrofarm.com.