Renewable Source - CO2 gas is exclusively produced from renewable resources within the agricultural industry. This means that the CO2 comes from sources already in the eco-system – we’re not adding any unnecessary CO2 gas to the atmosphere. CO2 Renewable CO2 Cylinders pair perfectly with?Carbonator III and Carbonator Pro models. Made with Organic Biomass - This renewable CO2 should not be confused with the CO2 gas extracted from underneath the surface of the Earth, isolated from our atmosphere for millions of years. Instead, our CO2 derives from biomass; corn-based bioethanol production that is continually replenished. It's then purified and certified to become a fresh, food-grade gas for sparkling water makers. Made for? - Designed specifically for all Carbonator models and made with the highest quality value, Compatible with most other screw-in style soda makers. Gas Cylinders are NOT Compatible with SodaSteam machines using Pink Cap Quick Connect system such as Soda Stream Terra or SodaStream Art. What's Included - 2x 60L Renewable CO2 Cylinder, The Cylinder Loop Exchange Program Instructions