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I know this is a stupid question but i never did it yet. To refill a 10lb bottle of Co2 is that that same co2 that you can get to fill up paintball guns. I know its NOT keg Co2. whatgrade is it?
 

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CO2 is sufficiently different from nitrogen or oxygen or hydrocarbon gases in its properties that getting almost pure CO2 isn't a big deal. So, my CO2 supplier, a fire extinguisher place, only has the one grade, and another place I checked out also had only one grade.
 
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