25
« on: January 02, 2013, 10:41:14 AM »
I've done both. A local welding shop will trade the tank. The homebrew shop fills by the pound. I'm not sure who they wholesale with.
The homebrew shop requires that you leave the tank overnight. They put it in their freezer so that they have it real cold and can fit the gas into the tank. If it is an old tank, they'll send it out to be hydro-tested.
The owner quoted me one price (w/the hydro-test including the CO2) and the cellar-boy adding the cost of the CO2 to the hydro-test price. After informing him that the boss had quoted me differently, he gave me the lower price.
I get my propane refilled @ a local gas station. That's much cheaper than the tank exchanges because you get a full tank.
When the tank approaches the need for retesting, I exchange it. I suppose it's gaming the system, but I'm not going to loose sleep over it.
It wasn't cheap, I paid over $75 for three tanks (a 5,a 10, and a 20#), but now I have enough CO2 to last a while.
The local hardware store fills paintball tanks for $7. A handy profit for them.