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Re : CO2 regulator

You mention that you have to empty the bell jar every so often to remove
air that has got into the CO2 mix in the bell jar.  If CO2 is constantly
bubbled at a rate of say a bubble every second or two and the excess simply
bubbles out of the bottom of the bell jar I do not see how any significant
amount of air could diffuse into the bell faster than it is pushed out with
the excess CO2.  I, however, do not know the rate at which air will diffuse
into a 'artificially' concentrated body of 100 percent concentration gas. 
It would, I guess, work like an arithmetic progression (similar to the
calculation used to workout the final concentration of elements for PMDD
when regular water changes are made).
Another point that may be helpful is to have an over flow tube fixed to a
hole in the side of the bell jar which takes excess CO2 directly out of the
tank.  In the light of the unfortunate experience of Dave Gomberg, the
overflow air line should be fed beyond the cover glass so that there can be
no build up of CO2 between the cover glass and the surface of the tank
water.  This way no additional CO2 is added to the tank except due to the
surface area of the bell jar.

David Brooks