IDS Home Aquarium CO2 Atomizer System Diffuser 16/22mm Hose air Regulator Bubble Counter It adopt Reserve Osmosis (RO) Technology that can diffuse CO2 in atomize Stage The usage of CO2 will much less than even, it also come out with complete dissolved rate and produces excellent effect for the aquarium For fresh water & marine tanks 16/22 mm DimensionsSize : 11 x 6 cm