I added borates to my pool about 3 weeks ago (via Borax and Acid). The process went fine, and I adjusted the PH after it was complete. I love the results. However, ever since then it seems my PH is usually higher now than before the addition of borates. By that I mean, when I test the PH every couple days, it seems like it's always up around 7.8-8. So I add some acid bring it to to 7.6. Before the borates, I very rarely had to add acid to adjust the PH.
Could this be related to borates? Or is it just a coincidence and really caused by rain or something else?