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CloseUse the HydroLogic Reverse Osmosis (RO) Water Filter 1/4 inch OD (outer diameter) Black or Blue Tubing for micRO-75™ , Stealth-RO™ , or smallBoy® to customize your indoor hydroponic garden. Use the HydroLogic Reverse Osmosis (RO) Water Filter 3/8 inch OD (outer diameter) Black or Blue Tubing for Evolution-RO™ or Merlin-Garden Pro™ to customize your indoor hydroponic garden.