Originally Posted by stevo4361
How long does a 20# tank last? Refill prices are damn close for me from 5 to 20 lbs. just the tank price to figure out if worth it or not.
4x as long as a 5#
it depends on whether or not you are force carbing, how much you purge etc - anywhere from 1/2# to 1# per keg is a fairly good estimate
if you already have a 5# tank I'd suggest getting a 20# tank used on craigslist or on here (as suggested) and keep the smaller tank as a backup.
murphy's homebrew law - your co2 tank will run out when you need it most