Our 30L C02 cylinders makes up to 30 liters of sparkling water, while our 60L CO2 cylinder makes on average 45-60 liters of sparkling water, but there is no one-size-fits-all answer to this question. That's what makes SodaStream so unique! How frequently you need to replace your carbonating cylinder depends on the level of carbonation you use.
If you find yourself replacing gas more than you'd like to, try reducing the number of times you push the carbonating button per use, and use firm 1-2 second pushes each time.
SodaStream recommends having at least 3 cylinders on hand, so you’ll always have bubbles and so you can exchange 2 at a time.