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Re: buffering for CO2

On Sun, 5 Jul 1998, RDotta7777 wrote:
> When I hook up my CO2 system (using a pH meter to trigger the CO2 injection),
> the water after a water change has a pH of approx 6.2.  I then allow the CO2
> to bubble in (at a slow rate).  In about 15 minutes my 125 gallon tank has a
> new pH of 6.1 and the system shuts off.  The pH never comes back up to re-
> trigger the CO2.  I have to add Sodium Bicarbonate to re-adjust the pH to kick
> the CO2 back on.  I have to do this every day.

This is rather odd behavior.  Not implausible, just odd.  So, instead of 
answering the question I have to ask two more:

What is the buffering capacity of the water you're using?

Have you calibrated your pH device and/or checked its results with a 
chemical indicator?

Roger Miller