How is the Aarke CO2 different from other brands? October 19, 2022 16:15 The food grade CO2 used in our cylinders is exclusively produced from renewable resources. This means that our CO2 comes from sources already in the eco-system, not adding unnecessary CO₂ to the atmosphere. Related articles How often should the cylinders be exchanged? Are Aarke’s gas cylinders compatible with sparkling water makers from other brands?