Features: 1. Made of high quality glass and ceramic membrane. 2. High efficiency of diffusing carbon dioxide. 3. Compatible with pressurized CO2 cylinder (need at least a pressure of 1 bar) 4. Package includes: 1 piece of glass CO2 diffuser. CO2 diffuser breaks down carbon dioxide gas into tiny streams of bubbles, also comes out with excellent dissolved rate and produces excellent effect for the aquarium. Before use, be sure to soak all the ceramic, disc, tube or surface for at least 30 minutes. To prevent breakage of the glass tube, wet it with water before inserting it into the silicone

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