(Someone) posted a long thread not too long ago about CO2 tanks and the purity of gases. He came to the conclusion that the tank is the point of concern. I would read up on paintball tanks before I used them with beer. Just my .02.
I have been reading up on paintball tanks, including searching the Forum. Not sure who "someone" is, just tried another search, etc. Haven't been on forum that much while I've been in the middle of a job change, parental health crisis, household move, & progress in a doctoral program... just took a rare break to dip in for advice.
This would be a new tank that would be filled, not exchanged.
Back to studying...