pH will vary depending on the time of day it is measured. In most systems it will be lower during the night. Light and oxygen both impact your pH. When the lights go out, pH will start dropping. Adequate flow will aid oxygenation/gas exchange to stabilize pH. I've often heard people recommend opening a door or window allowing fresh air into the house to raise pH. Trouble with that is it's pretty much out of the question during the winter.
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