Two pounds of stabilizer in 12,000 gallons raise the CYA by about 20 ppm. You can add another 2 pounds.

My pool runs on 60 ppm TA because that's the level in my fill water. Since all values hold well and I have no pH fluctuations, I leave it alone. My pH stays at 7.5. If yours tends to drop then you could raise alk to 80 and see if that helps.

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