The Under Current® is the worlds first re-circulating Water Culture Hydroponic System featuring our Patented Sub-Current Culture® Method. This innovative application circulates literally hundreds of gallons of solution per hour beneath plant roots. The Under Current® supercharges the solution with dissolved oxygen, creating a hyper aerobic condition. All Current Culture Systems now come with white ABS lids. These new white lids are made of durable ABS plastic, are UV stable, 100% non-translucent and highly reflective. New side-entry air ports on all Current Culture Under Current® system now include an innovative side-entry for the air diffuser lines utilizing a uni-seal for each module. This allows you to remove the entire module lid without disconnecting the air lines, making root-zone inspection much easier.