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[APD] Re: CO2: How much is too much

At 09:02 4/24/2005, John T. Fitch wrote:
 I looked at the controller and saw
that the pH had dropped overnight from 6.7 down to 5.9!  So, all night the
probe was telling the controller that the pH was above 6.7 and to keep
pumping in CO2.

This is one of the many reasons folks who have been using CO2 for a while run it 24x7 or with a shutoff timer at night that does not cause problems if it fails.

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