Hi,
The left guage tells you how much gas you have in your cylinder.
It is about 1100 PSI now, when it drops to 300 or less, you will notice that the bubbling starts to slow and it is an indication that it is time to refill. Not sure whether it is pure co2 or not, but definitely it would be difficult to achieve steady flow.
The right guage tells you how much pressure you have at your needle valve, it is normal to be between 20-30, it indicates the pressure at which gas is leaving your cylinder. You don't want it to be too high, else it would be difficult to control the bubbling rate, as far as I know.
I suspect the boss at Biotope is telling you to bring the cylinder for refill once the Left guage falls below 300, could be a miscommunication.
I am basing my suspicion on personal experience, I too top up my co2 at Bioplast and that was what the boss told me the other time
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