Here's a handy baseline for you, Mike.
For a 5 lb CO2 tank - 1 bubble per second (1X) for 24hr/day (1X) will last six months.
For a 10lb tank --> one year
So, for 8 bubbles (1/8X) per second for 8hr/day (3X), your tank will last:
One year x (3/8). 3/8ths of a year = 4.5 months
IME, at the rate you are running, you'll see the high pressure gauge drop to zero over the course of about 2 weeks.
|