-Super fine and high rate of CO2 diffusion -Total 100% dissolution in water -Inline design for use with canister filters -Simple install, mounted below or directly to aquarium This easy to use, discreet CO2 diffuser provides professional quality and value. It mounts inline with canister filters with an inner diameter of 12mm (1/2”) and outer diameter of 16mm (5/8”). It produces an ultra fine mist with an average bubble size of less than 0.1mm in diameter. Avoid direct contact with the ceramic and handle with care. Fill bubble counter with water only. A minimum of 30 PSI of pressure is required. Use only high pressure rated, acid resistant tubing. Silicone tubing is not recommended Clean with a 3:1 water:bleach solution overnight every 6 months or as necessary.