...Controlling CO2 as tanks become larger becomes exponentially more difficult.
The present system is excellent.
But measuring how much CO2 is coming in as a rate is impossible, so we going to use a special flow meter for gas that's very accurate(Welding flow meters are too much, and not as accurate as we need).
I think that will help a lot.
Flow rate is too low and there's no suction for the filtration in the lower parts of the tank. I did not design the tank however.
I also put at least -2 drains down there, this would have gotten 4-6.
So it's a bit too late for that.
The diffusion method works very well, 30-40minutes to drop a full point or about 45 minutes to target a CO2 level.
Anything less than 1 hour is ideal.
Now it's just a matter of good stable control.
I suggested a victor medium duty regulator and clippard or german solenoid pair, we have good needle valves, tubign etc, we just need a better solenoid/reg and flow meter.
You cannot count 40 bubbles per second for example, even if you split the CO2 up into 6 lines using the ADA counters, it's still too hard to tweak the rates.
So the new flow meter ought to be a good thing as well as the solenoid and Victor reg.