Originally Posted by SmokingGunn
Fire extinguisher companies and paintball shops all get their gas from welding supply companies.
I am sure many of them probably do. Most likely TX-straggler's LHBS does the same (or maybe from some bulk supplier like Praxair).
At least if he takes his nice new shiny tank to the store to get it filled instead of exchanged he will still have a nice new shiny tank when he walks out of the store (even if it is filled with basicaly the same CO2 out of a rusty repainted steel bottle that he would have gotten with an exchange).
I think the biggest problem TX-straggler had was simply a lack of knowledge on how to properly carbonate kegged beer, not a problem with the CO2 that was in the tank he purchased or even the tank itself. Hopefully he is beyond that lack of knowledge through the information provided in this thread and any other threads that he has read when trying to solve his problem.