Active Aqua Root Spa 5 gal 4 Bucket SystemDescription Deep Water Culture System: The Root Spa is an efficient deep water culture system. Displaying the advantage of a simplistic design, this 5 gallon bucket system fosters the growth of large plants with ease. Its unique feature of infusing pure air into the nutrient solution without the need for expensive and often troublesome air stones is not only cost effective, but also encourages your plants to thrive! System Components: Watertight seal