I have been using my pool all summer with no problems and last week it suddenly went green.
I measured the FC and it was 0. So no suprise there.
Now I shocked it, i have the sand filter running 24/7 and I am waiting.
2 days later my FC is 8.8
PH 7.1 and TA 86.
The water is still very green. Should I shock it again?
Thanks for your help