Filling CO2 Bottles?

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Just look in the yellow pages under welding and take the bottle in and they will swap it out for ya.
 
I had mine filled in Kent, they filled my bottle, and didn't have to swap. Didn't want to lose my shinny new bottle. But it was easy for me to drop off and then come back to pick up, they fill every day....
 
My understanding was that welding shops like Central weld have a lower grade CO2 (contains impurities). I was told to use places that fill hospital tanks.

Does anyone think that filling up bottles at weld shop will be a problem?
 
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