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Re: CO2 How long sshould it last>

If you are continuously bubbling CO2 (24-7) then 3 months is pretty average, 
IMO. The average for a 20# tank seems to be about a year, although this also 
depends on the original fill in your tank (amount of CO2). My last 20# tank 
lasted 16 months, but I use a controller and do not bubble continuously and 
had 100 psi to start rather than the usual 800-900.