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The Duma tray is a popular system for all kinds of growing techniques but especially rock-wool slabs. A 104cm x 79cm tray is perfect for 4 rockwool slabs with 5 plants in each slab. An equally successful technique is using 12-11 7lt square pots with soil and sprinkler system. Trays can be mounted on a frame and drainage can be connected in series using PVC pipe and fittings, making flushing an ease.