Chihiros CO2 Diffuser (S) Diffuser allows an effective method for CO2 to enter aquarium. The CO2 is pushed through a porous medium that breaks down the gas into a fine mist of bubbles. These bubbles are then more easily absorbed by aquarium water. Four sizes available: Size Diameter Tank Size Tiny 11mm under 50L S 13mm under 100L M 17mm 100-200L L 23mm Above 200L
