The Root Riser is an aerobic root spacing product for better drainage in hydroponic tray systems. This square plastic spacing element attaches to the bottom of rockwool blocks and other hydroponic grow blocks. Root Risers elevate grow blocks slightly above the tray surface and allow for optimized drainage and robust root growth throughout the plant’s maturity. The Root Riser can accommodate most sizes of rockwool blocks and other popular growing substrates. The Root Riser is manufactured in California from recycled plastic and is easy to clean (dishwasher safe) which drastically reduces your turnaround time.