IWS AutoDrain SystemRemove Run Off (and Back Ache!) with IWS AutoDrain Grow Systems Choose an IWS AutoDrain grow system and take the headaches out of your feeding routine by pumping waste away automatically. How AutoDrain Systems Work When growing in soil or coco you will need to allow for around 10% run off to adequately saturate the substrate. This run off has to go somewhere, but unfortunately, in many cases, it ends up getting left in saucers or trays. Roots hate
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