I've been trying to balance everything according to the sticky for SWG water balance, and I'm having trouble keeping my pH swings under control. We just had the pool replastered about 8 weeks ago, so I'm guessing that's part of the problem, but it seems like things should be leveling out by now.
Here are my levels as of tonight:
FC - 3 ppm
CC - 0
CYA - 50 ppm
pH - 8.0
Alk - 120 ppm
Calcium - 250 ppm
I know CYA is low - it was at 40ppm last week, and I've been slowly raising it. I added more stabilizer tonight that will hopefully get it above 60ppm after it dissolves. Getting this raised up should allow me to dial down my SWG from the 35% it runs at now, which I guess will help my pH swings a little.
I've been adding 1/2 gallon of acid every 2-3 days, which will bring the pH down to 7.2-7.4, and within 2-3 days it's up to 8.0 again. It's not as much as I had to add right after the replaster job, but it still seems like a lot.
I added another gallon tonight and am running the spa blower and waterfall for aeration, hoping to lower the Alk more. I'm also going to look into adding borates. Is there anything else I should be doing? Is this normal because of the plaster curing, and if so how long can I expect to keep dumping so much acid in the pool?