There isn't really "food grade" CO2, just CO2. I bought a CO2 delivery service business in college that was a sideline of my friends dad's business. He was bu

There isn't really "food grade" CO2, just CO2. I bought a CO2 delivery service business in college that was a sideline of my friends dad's business. He was buying tankercars of CO2 for welding to get a lower price and then selling his "cheap" CO2 to bars.