We'll see how long it lasts. I'm hoping a couple of months at least. Note that I did loose a little Co2 when setting up. Due to a leaky solenoid vavle, but I don't think that it's enough to make much of a difference.
Marc: The lowest I've tried is 2 bubbles a minute, but I am now up to 4 bubbles a minute.
I've never used a diffuser before, but for some reason I thought that it would put out a finer mist. Most of the bubbles come out of only one spot on the disk and float right to the top. I would have thought they would float around the tank more. It's brand new so I don't think it could be clogged yet. Anyways going to fine tune the bubble rate over the next few days to dial it in.