The Under Current® Recirculating Deep Water Culture (RDWC) System features the patented Sub-Current Culture® circulation method. This high-performance water culture system is unmatched in efficiency, layout versatility and ease of use. The Under Current® utilizes negative water pressure to recirculate oxygenated nutrient solution through the plant’s root zone ensuring pH and EC levels are uniform throughout the entire system. Includes: 8 gallon multi mod growth modules with drain well, 18 in center 5.5 in heavy-duty white lids with porthole, 5.5 in heavy-duty net pots, easy clean manifolds with UC spin-tight bulkheads, add-back kit, high flow aeration manifold, air pump bank with air flow regulator, premium linear air pump(s), Danner Mag-Drive return pump with 1 in return hose, adjustable float valve with reservoir adapter kit, optional drain out kit available, and Cultured Solutions XS Growers Pack. The 4 site system has a grow area of 2 ft 10.5 in x 5 ft 4.5 in, 6 site system has a grow area of 2 ft 10.5 in x 6 ft 10.5 in, 8 site system has a grow area of 2 ft 10.5 in x 8 ft 4.5 in, 12 site system has a grow area of 2 ft 10.5 in x 11 ft 4.5 in and 16 site system has a grow area of 2 ft 10.5 in x 14 ft 4.5 in. These items are drop ship only.