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[Watermom]

Good catch. For some reason, that cc reading did not pop out at me. The madczar is right. You do need to shock your pool per the Best Guess Chlorine Chart.

[Enterline]

Thank you all, working on it now. Will get back with my data. I'm sure I'll have more questions along the way. Thanks again!!!

[Enterline]

OK, back at it, update: FC is now at 10, which, according to the chart is much better considering the CYA of 75. CC is down to .5.

PH is somewhere between 7.0 and 7.2, can't decide which, but on the low side. How much borax is good to start with, 20K gal pool? Suggestions?

Thank you!

[Themadczar]

My thought is to aerate the pool and raise the ph though co2 outgassing... Ta is already 130 and adding borax will increase it further. JMHO.

[Watermom]

Borax won't increase the TA. If you use soda ash, it will increase pH and alk but Borax won't. That is why we recommend using it to raise pH instead of soda ash.

You can try and aerate to bring the pH up or you could add a little Borax. I'd probably do a couple of cups to start with. Then, wait a few hours and retest and redose as needed til you get the pH where you want it.

[Themadczar]

Oops. I stand corrected.