My pH is 7.2 this evening. I had drained some water off yesterday trying to lower my CYA. At best guess, I'm at 80 now on my CYA. I don't know if the drain and refilling has anything to do with the pH. But, I was pleased to check after swimming to see that my FC was at 7. I"ll bump it up to 10 tonight for another sunny day tomorrow. My question is, will the pH rise on its on or do I need to add borax to get up?