The ista UFO CO2 Diffuser provides a delicate CO2 diffusing effect. The top quality design allows the replacement of the diffusing ceramic; eliminating the clogging problem. The CO2 pipe can be fastened to the diffuser in a vertical position. This prevents the pipe from bending which restricts the flow of CO2. To have the best diffusing effect, place the diffuser in the very bottom of the tank to maximize the CO2 diffusion in water (creating more contact time of CO2 bubbles with surrounding water). Includes a silicon suction cup.