Published September 12, 2018 15:02 What is the shelf life of a carbonating cylinder? This gas lasts. The carbonating cylinder has no expiration date. As long as your carbonating cylinder is stored in a temperate environment, it will remain usable indefinitely, with no concern of spoilage. Related articles How often will I have to replace my carbonating cylinder? How long will my sparkling water last before going flat? What's the difference between exchange vs back up carbonating cylinders? What is the shelf life of SodaStream's Sparkling Drink Mixes? Is it safe to have a carbonating cylinder in my home or kitchen?