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? What's the difference between exchange vs back up carbonating cylinders? Is it safe to have a carbonating cylinder in my home or kitchen? What is the shelf life of SodaStream's Sparkling Drink Mixes?