Hydrofarm Active Aqua Root Spa 8 Bucket System 5 galProduct Details The Root Spa is a Deep Water Culture system. This 5 gallon bucket system is so simple yet grows large plants efficiently. After a very short time, you will realize the advantage of the simplicity of this uniquely easy to use, inexpensive, and forgiving system! Pumping raw air into the nutrient solution, without the need of expensive and often troublesome air stones is not only cost effective, but your plants will also thrive! Water