Hi Watermom. Thanks for a quick reply.

My bad on the pH. I meant would raising the CYA stabilize the FC without messing up the chemical balance of the pool. I was thinking about raising it to around 60.

I have used "Alkalinity Up" to raise the pH. My test kit (TF-100) and other things I've read say I should keep the TA between 100-120, but when I add the Alkalinity Up, it takes quite a bit of Muriatic Acid to bring the pH back down to an acceptable range. Now I'm reading that if I have a high CH, I should keep my TA and pH lower, as you said. I guess my question what be what is a good range for the TA? I'm working to keep my pH between 7.2-7.6.

I just tested the CH coming out of the faucet next to my pool equipment, and was shocked to see it was 200. I tested my pool water again, and it came up 700. Somehow it has really gotten out of whack. I just did a partial refill of my pool (50%) late last fall, so I'm baffled.