The IWS Pro 48 Pot hydroponic flood and drain growing System. The main benefit of the Pro System over the regular systems listed below is that the Pro System fills and drains twice as quickly, giving you better control of your feed times and avoiding leaving your root mass submerged in nutrient solution for longer than needed. The main differences of the Pro 48 Pot System over the regular 48 Pot Systems are: 700ltr nutrient tank (as opposed to 350ltr), 7000ltr per hour nutrient feed pump, 25mm feed pipe and fittings, 2 drain pumps and higher rated control boards for the larger pumps. The Pro Flood and drain system is available with a choice of two inner-pot mesh basket liners for relevant growing medium types, which allows for optimum drainage. IWS 48 Pot PRO aqua/culture system includes: 700ltr nutrient tank with pumps, brain pot controller with timer, 48x round stands 48x aqua/culture pots, 24x elbowss, 24x tees, 60m tubing and instructions.