My pool has a sky blue Quartz finish. I have been noticing black dots in the Quartz. I put on a mask and went diving. It is not Algae. Its like parts of the peebles in the finish are turning black. They look like a tiny mark from a sharpie. They are flat within the finish itself. I have tried vitamin c tabs, Chlorine puck and tried to brush and scrape them. Nothing works. Has anyone ever heard of this problem?
My current numbers are from today. Water is clear and 77 degrees.
FC - 5.4
CC - 0
Ph 7.8
TA -100
CH - 320
cya - 80
Salt - 3200
My current numbers are from today. Water is clear and 77 degrees.
FC - 5.4
CC - 0
Ph 7.8
TA -100
CH - 320
cya - 80
Salt - 3200