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Re: Aquatic Plants Digest V3 #365
In a message dated 98-07-05 16:18:43 EDT, I wrote:
<< On Sun, 5 Jul 1998, RDotta7777 wrote:
> When I hook up my CO2 system (using a pH meter to trigger the CO2
> the water after a water change has a pH of approx 6.2. I then allow the
> to bubble in (at a slow rate). In about 15 minutes my 125 gallon tank has
> 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
> 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? >>
It seems that the buffering capacity is the issue. The water measures a
Carbonate hardness of 40ppm with the LeMotte test kit which I equated to a dCH
I just recently (two days ago) recalibrated the pH meter.
I think that the water's buffering ability is low, but it seems difficult to