Published February 17, 2020 12:10 What do I do when my gas cylinder runs out of CO2? Don’t let your busy schedule interrupt your sparkling water. You can get replacement cylinders online or in the store. Check out the guide below to learn more! Related articles What's the difference between exchange vs back up carbonating cylinders? My sparkling water is not fizzy enough. Help! How do I install the carbonating cylinder in my sparkling water maker? How should I store the carbonating cylinder? How do I know if my carbonating cylinder is empty?