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Re: [APD] CO2 and pH control

Gordon and Susan Watkins wrote:
> The pH reading is coming from the sump of my trickle filter using a 
> Milwaukee controller. Right now, with CO2 running, it shows 8.1. I 
> checked another tank which has been set up continuously for over 25 
> years and, using the same electrode, it showed 8.9. What else could 
> account for the discrepancy?

You could have gravel or decorations which are buffering your pH. Things 
like shells, coral, limestone, marble, etc. will do that.

I intended to ask what is the pH of the tap water after it has sat out 
for awhile (not in an aquarium).

Jerry Baker
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Aquatic-Plants at actwin_com