TC = 5
FC = 5
CC= 0
pH=7.4
TA = 100
CAlcium Hardness = 500
CYA=60
Salt pool. Resurface about 8 months ago with pebbletec. I have a few spots that wen rubbed with Vit C tablets go away. They seem to reappear every few weeks. My water is very low in metals and iron. Looking for ideas as to the...