Watch the Under Current hydroponics system easy assembly video to see how to get set up for unparalleled oxygen delivery and nutrient circulation to plant roots mean that that lower nutrient concentrations are required to produce the best growth rates and crazy yields achievable from large plants in an active hydroponics system. Because the Under Current uses less nutrients and operates as a closed re-circulating hydroponics system it is sustainable and actually saves the water it takes to produce high yielding crops, whether outdoors under natural light or when growing indoors with H.I.D grow lamps. Used to your crop taking 8 or even 10 WEEKS in vegetative growth when you have to pay for more power to run your grow lamps for longer periods to get to a good sized to produce monster yields per plant in the bloom phase? In an Under Current XXL system you could do the same in 4 to 5 weeks! Seeing is believing.