[swylie]

Originally Posted by danakin

What about doing something with a cartridge like http://www.divers-supply.com/Product...05&click=10168

I assume the principle is the same, but how long would something like that actually last (very short to be sure)

Not very long. A 16 gram cartridge would last about 35 times less long as a 20 ounce tank and 140 times less long than a 5 pound tank.

Using a smaller cartridge doesn't make things any easier, you know, it just makes things smaller. Compressed CO2 has the same pressure no matter how much of it you're dealing with, so you'll need a regulator regardless.