IWS Flood and Drain Standard SystemOverview The Nutriculture IWS Flood & Drain Standard system hyper oxygenates your crops during every feed. The system offers ultimate control levels, excellent drainage and increased scalability and flexibility. The system is easy to manage, accelerates your plants' nutrient uptake and delivers increased levels of oxygen to your crops. The waste rate is low as the nutrient solution is stored between feeds. You can expand the layout and place the pots