CO2 consumption in calcium reactor

[Delphinus]

It's hard to say for sure, since different bubble counters will have different bubble volumes and that can account for a lot of variation. I use the Milwaulkee regular/bubble counter combo units, and using them I've had bubble rates around 100 bpm last me about 1.5 years on a 20lb cylinder. So I would guess you should be good for a year, or close to it.

I do have a 2.5 lb cylinder and using the same bubble counter on a FW tank, and a bubble rate of about 30 bpm I get about 6-8 months between refills. The little cylinder is cute and all, and conveniently small to hide in a stand and whatnot, but it exhausts a little too quickly for my liking. Given that the cost difference for fills between the two is negligible, the lesson I learnt is that there isn't a whole lot of cost savings in the long term using the smaller cylinders. Anyhow I digress a little, I was just thinking that in terms of comparing to this .... I would think you're good for a year on that 5lb cylinder.