Quote:
Originally Posted by whatcaneyedo
I've been finding that after about 3 months my pH controller starts to read my tanks pH about .2 higher than if it was freshly calibrated. For instance, in the summer the tanks normal pH range is 7.9 to 8.1 So if after a while the controller starts reading it up around 8.3 I begin the question if the controller is lying to me and if I should re-calibrate the probes. Do the rest of you experience the same thing or does your pH reading go down in time?
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there can also be some reasoning behind the .2 drop as well. in the winter you are more likely to keep windows and door's shut which will raise the indoor c02 level's. Which could potenially lower your ph