I've got a plaster pool and about a month ago I noticed little black spots popping up in the deep end. Lightning had tripped the SWG breaker and so FC was down to 0. I brought it back up to 4 and took a stainless steel brush to the spots. But slowly over the course of a week or two the spots started to come back.
The water is clear, Overnight FC loss test is just under 1.0 ppm, and the CC is .2 so how could algae be growing?
Here are my test results?
FC - 3
ph - 7.9
TA - 90
CH - 300
CYA - 80
The water is clear, Overnight FC loss test is just under 1.0 ppm, and the CC is .2 so how could algae be growing?
Here are my test results?
FC - 3
ph - 7.9
TA - 90
CH - 300
CYA - 80