CO2 ratio and percentage

Only GW seems to like to feed FGAs with out of spec POCs and even then only when they are David's FGAs.

I am too frightened of messing up my FGAs so I dont know at what point they give up. I am usually watching the PPM of Co and that seems to go into the hundreds before they stop working but by that time I am withdrawing the probes as a priority!
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