The IWS Pro system is a premium quality version of the already successful IWS flood and drain system. We have been developing this system based on years of feedback from our customers; we’ve tested it thoroughly and had great results. The idea behind the Pro system is to fill and drain as quickly as possible, it takes less than half the time of a normal system. The main benefit of a Pro over a regular system is that the bigger sized systems fill and drain 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.