FC - 1.5
CC - 0
PH - 7.6
TA - 60
CH - 360
CYA - 30
Borates - 50-80
I have been accumulating a black residue that feels a bit like old adhesive on the top of my thermometer, which invariably ends up in one of my skimmers so that water is always flowing over it. I am pretty sure it is not adhesive as I have cleaned this off several times now. Pool water is crystal clear. Any thoughts? Picture is attached.
CC - 0
PH - 7.6
TA - 60
CH - 360
CYA - 30
Borates - 50-80
I have been accumulating a black residue that feels a bit like old adhesive on the top of my thermometer, which invariably ends up in one of my skimmers so that water is always flowing over it. I am pretty sure it is not adhesive as I have cleaned this off several times now. Pool water is crystal clear. Any thoughts? Picture is attached.