Disposable CO2 bottles Each water dispenser requires food grade CO2 gas and ie E290 carbon dioxide. These have the classic M11x1 connector and are compatible with all coolers that use disposable bottles. For example, a 600g CO2 bottle can bubble between 90 and 120 litres of water. The disposable CO2 bottle should only be used vertically to prevent liquid CO2 from clogging the pressure regulator. As this is compressed gas in liquid phase, you should store the cans from heat sources and in a dry place. The CO2 bottles can last 3 to 4 years.