I'm getting ready to drain and refill my pool in order to reduce the CYA and CH. I also have three black spot areas that I can't brush out, I was wondering how to remove the spots after all the water is drained.
Here are my test results from yesterday:
FC = 8
CC = .5
pH = 7.5
TA = 150
CH = 600
CYA = 240
Here are my test results from yesterday:
FC = 8
CC = .5
pH = 7.5
TA = 150
CH = 600
CYA = 240