Published 17 February 2020 12:03 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 gas exchange vs back up gas cylinders? My sparkling water is not fizzy enough. Help! How do I install the gas cylinder in my sparkling water maker? How should I store the carbonating cylinder? How do I know if my gas cylinder is empty?