My pool was replasterd and started up in early July, 2018. It's my understanding that pH tends to creep up after replastering requiring attention and acid addition. But 2-1/2 seasons later, I still seem to be constantly fighting with my pH creeping up. I keep track of acid consumption, and I've added an average of almost 10 ounces per day of 20 Baume Muriatic acid to try to keep my pH down in a reasonable range--i.e., slightly below 7.8. As an example, I'm getting ready to close my pool, and my pH was 7.6 on 10/13, and with no acid addition crept up to 8.1 in six days (10/19). I'm concerned that if I close my pool and stop adding acid my pH will quickly climb to an unacceptable level (it was 8.5 when I opened my pool this spring on 5/13/2020).
Is this reasonable, or am I missing something? What should I be doing about pH monitoring/control over the winter?
Current (and typical) water chemistry is:
pH: 8.1 (as of 10/19--typical is 7.8 or slightly less)
Free Chlorine: 5 ppm
Combined chlorine: 0 ppm
Total Alk: 70 ppm
CYA: 30 ppm
Calcium Hardness: 300-325 ppm
Is this reasonable, or am I missing something? What should I be doing about pH monitoring/control over the winter?
Current (and typical) water chemistry is:
pH: 8.1 (as of 10/19--typical is 7.8 or slightly less)
Free Chlorine: 5 ppm
Combined chlorine: 0 ppm
Total Alk: 70 ppm
CYA: 30 ppm
Calcium Hardness: 300-325 ppm