Hi,
Water seemed perfect when leaving on short 4 day vacation.
Returned, opened pool and had black stains??? Will try to attach photo...
Water chemistry when we returned on 6/13/16 @ 2:07 PM:
FCL = 9.23
TCL = 9.59
Br = 18.0
PH = 7.3
ALY = 147
CH = 165
CYA = 79
Phosphates <100
Water temp was...