I'm getting a lot of rain right now... for days at a time.... than I did in the summer. And I decided to wait until my FC fell below 10 to check my pH, which (for the first time) was at 7.8. I noticed in my reading/testing log that I often checked my pH level when my FC was a tad bit above 10, so I may have been getting inaccurate readings for a long time. However, it didn't dawn on me that I was reading my pH at a higher FC until it was brought to my attention with an earlier post I read. So last night, I decided to wait until my FC fell below 10 to take my pH reading and that's when I realized that my pH was at a 7.8. Thus, I may have been adding borax when I really didn't need to. Not sure....
I just wanted to see why my pH would fluctuate, then again.... it could be that I was not testing it right to begin with. Not sure. But I'm getting A LOT of rain right now though. Could that explain things?