Membrane Diffuser Double

Unlike conventional dispensing methods that dispense CO2 as a gas bubble into the water, which then ascends and releases CO2 out the top of the aquarium, this diffuser is different. It passes CO2 through its special membrane directly, dissolving it directly into the water. You won't see any ascending bubbles, nor will CO2 escape out the top of your aquarium. This method ensures a 100 percent use of CO2, so you won't have to refill your supply tank as often. Diffuser should be suction-cupped as deeply as possible in an area of good circulation. Measures 4" x 1-3/4" x 2" high and includes four chambers and two suction cups.Please click on "More Information" for installation.