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The IWS RDWC differs from the standard DWC system in that the R-DWC offers two recirculating options to suit the growers needs. The entry level IWS R-DWC you will need to change the solution in the water butt every week. The Pro IWS R-DWC comes with a timer which remixes the nutrient solution every day, sending the solution from the mixing chambers, back to the water reservoir, keeping the mix balanced, oxygenated and cool. As this system is re-circulating it helps to stabalise pH, temperature & nutrient strength and provides a richer content of oxygen. It also helps to promote uniform growth so plants obtain an even nutrient profile, pH, EC & light exposure.