IWS Flood & Drain System The IWS Flood & Drain System is available in different sizes to suit your needs. Each kit comes complete with a water tank, brain pot with timer, flexi pipe, pots, stands and all the fittings. Clay pebbles and rockwool are the most commonly used medium for this system.The IWS Flood & Drain System is a highly developed ebb and flow system, which delivers the optimum amount of nutrients at the right time. Controlled to the minute via the high spec timer unit, y
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