Published December 01, 2019 12:41 Will my carbonating cylinder expire? 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 need to replace my carbonating cylinder? How long will my sparkling water last before going flat? Is it safe to have a carbonating cylinder in my home or kitchen? What's the difference between exchange vs back up carbonating cylinders? What is the shelf life of SodaStream's Sparkling Drink Mixes?