This is my first post, and I'm hoping you folks can help me identify the algae infestation in our pool. First, here are my test results from today:
FC = 4.5
CC = 0.5
TC = 5.0
CH = 475
TA = 110
pH = 7.8
CYA = 50
I'm pretty sure the problem here is algae; I determined this using a 3" chlorine puck in a sock on the pool surface - it cleaned up the algae beneath it.
I also tried the vitamin C rub, and it had no effect (I took the rest of the tabs, they seemed to have no effect either).
I uploaded 2 pictures, which I took today. The sky was overcast, so the mottled stains are dark. In bright sunlight, they are yellowish in color. I used a zoom for the bottom picture.
I'd appreciate any diagnosis information and advice. Thanks!