On the 16th I added 1 gallon of muriatic acid. Today I tested & got these results:
FC=2.8
PH=7.8
Alk=90
CYA=120
CH=620

So I added another 1/2 gallon of muriatic acid. My PH is down to 7.2 but do I need to deal with the hardness? My fill water only 150. I have a feeling it's time to drain half the pool. Ouch.

Do I need to deal with the CH & CYA?

Thanks,
Kirk