Personally, I never like the tank exchange program. I have a nice, shiny tank and I'm trading it for an old beat up one. I'm the same way with my propane tank on my grill. I always insist on having it refilled rather than trading it.
I have found that if a facility has the ability to fill CO2, they will tell me to call first to see if they have the CO2 pump running. They some times only run it during certain hours of the day.
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