You mentioned there is a difference between food grade CO2 and other grades. I have heard this before but never heard an explanation. What is the difference?
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Food Grade Co2 is filtered and certified for human consumption. Industrial grade Co2 can contain oils. But with that said, since the beverage industry is one of the largest consumers of Co2. Most locations just carry the food grade. But it is always good to ask. If you see an oily film on your beer, check your tank.
Brace the tank well and place a white piece of paper about 4-6 inches from the nozzle.
Open the valve in 3-4 burst. ( Tank should be WELL secured) you will see some moisture on the paper but there should not be any dark or oily residue. If so tell your supplier and make sure you get a newly filled tank.
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