I'm doing the TFP method. Easy to add a little bleach every day. Works great! A wonderful sense of satisfaction and pride when you get the dosing just right, and your tester confirms that you're staying between min FC and the target, and you know your pool is staying clean. But I'm constantly running PH around 8 or a little more unless I add almost as much acid as I do bleach. I read somewhere on the site that the PH spike is only temporary when adding bleach, but even if my FC gets down below 1 before adding my daily dose, my pool still has high PH. I'm finding, if I add 8 oz of acid each day, I can keep it in range. The high PH is confirmed at the pool store, so it's not just my tester. I'm not aerating. I've not even been in the pool this season. Last year I was running high FC, because my CYA was over 70. I thought that was the reason I was constantly fighting high PH, but this year, I opened to 31 and am staying between 2 and 4 FC. Have shocked a couple of times right after opening, even though it probably wasn't necessary. So is constant adding of acid normal? Something to do with shocking with bleach? Because it's a small pool? Or something else?
I've got an 18' round with vinyl liner with a strong pump and large filter for this size pool, but the pump is not so strong that it creates a whirlpool.