Join Date: Jan 2006
Location: Cherry Hill, NJ
CO2 gas is the same whatever the source, however, yeast do not produce 100% pure CO2. They produce other gasses as well, and most of the gas that enters the tank is nitrogen (from the atmosphere). This means that the concentration of CO2 gas that yeast puts out is quite dilute compared with a pressurized CO2 tank. I would estimate that the CO2 % in the gas yeast releases is probably only a few % compared with 100% CO2 in a pressurized cylinder.
The concentration difference, ease of use, lack of yeast container explosions, cheap refill cost vs. cost of sugar, and consistency make pressurized CO2 worth every cent and far superior in every way. There is no comparison between DIY and pressurized, the difference is like light and darkness.