The Flo-n-Gro® Riptide™ Under Current® system was built with serious growers in mind. Built in cooperation with Current Culture H2O™ using their patented methodology known as Sub Current Culture™, this system creates explosive growth and record breaking yields. A powerful mag-drive pump coupled with an efficient, high quality linear air pump creates a highly oxygenated and balanced environment for your plant’s roots. 3 in piping allows for optimum flow throughout the system. Bulkhead fittings allow for a water tight connection to the plant sites. This system features 13 gallon growing sites, heavy duty 8 inch mesh pots, and sturdy injection molded lids with port hole. The Flo-n-Gro® Riptide™ Under Current® 4 site expansion kit includes everything you need to expand your existing system by 4 growing sites.