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CO2 end of tank experiment.
The 20# CO2 tank that services my 125 gallon aquarium is about to go empty. I
am going to let it go all the way down to empty and see if there are any
issues with the regulator/needle valve, etc. The regulator is a Champion
Lighting BlueLine regulator. It is a single stage, dual gauge regulator (tank
pressure gauge and adjustable step-down pressure gauge), with a solenoid and
a needle valve. A pH controller turns the solenoid on/off. The CO2 goes thru
a Dennerle check valve (the same mid-quality one as M3 sells), and thru an
Aqua-Medic Bubble counter (with built in check valve), and then bubbles into
the intake strainer on an Eheim 2217. The AM bubble counter is not necessary,
but I like it as it gives an at a glance look at the gas flow. The tank went
below 500 psi a couple weeks ago and is currently at 250 psi. The bubble rate
slowed a bit, and I have adjusted it up to where it was before the tank
pressure dropped (1-2 bubbles/sec) by opening the needle valve a tiny bit. No
problems so far. I have a spare 5# cylinder for these situations, and will
switch tanks as soon as the 20# tank goes dry.
I'll keep you posted if anything happens- good or bad.