Bars, breweries, and restaurants typically source "beverage grade" CO₂ from gas suppliers like Airgas or Air Products. These suppliers provide large cylinders (e.g., 20lb to 50lb tanks) and often offer delivery services.
When buying CO₂, the "purity grade" matters depending on your application: buy carbon dioxide
Used for welding or chemical manufacturing. buy carbon dioxide
Most people buy CO₂ in small pressurized cartridges or cylinders. buy carbon dioxide
For scientific or manufacturing needs, specialty gas companies like Messer Group provide ultra-high purity CO₂ (up to 99.99% pure). Quality and Purity Grades
Purchased by individuals or companies on the voluntary market to "neutralize" their own emissions by funding projects like tree planting or carbon capture.