Thanks for all the advice! This forum has been really helpful. I've learned a lot here.
It sounds like I'll have a good amount of time to get the cylinder refilled after I see the tank is getting low so I don't have to worry about being able to get it filled immediately.
I went ahead and weighed my cylinder to try and get an idea of how much CO2 I have left. Right now it's about 22 lbs altogether. I don't know the exact weight when it was filled originally, but the cylinder markings show the empty cylinder weight is around 14.5 lbs, and the shipping notice on my regulator showed about 4.5 lbs. So that means I probably have about 22 - 14.5 - 4.5 = 3lbs of CO2 left. I'm guessing that will last about another 4 weeks then, although it's hard to tell since I was originally running it for 10 hrs/day and playing around with the bubble rate, and now I'm down to just 8 hrs/day.
Thanks again!
- Mike
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