And after draining the pool by half I got the pool form 120 CYA to 60 and CH from 440 to 360...then I had pH of 7.6 after shocking for two days. Then rechecked FC was 7...target 5 to 9 ppm. And oH was still 7.6. TA was 110.
A week later the the pH is 8.2 or higher, and TA went to 220 ppm.
First why...i need to understand that, and then pH down to 7 to 7.2 then aerate back up to normal pH?
I really want to know what caused this. As I wonder is it from bringing shock level up to 32ppm and holding it there? If that's the case will it go down over time.
30 x 12 in ground fiberglass pool.
Numbers tonight were
FC 10 ppm,
PH 8.2 or higher