hey guys, bought a house 3 weeks ago that had a pool, 20x 40 inground gunite, the water looks great, but now im getting this stain on the wall all of the sudden. its hard to notice it unless u get in the pool, then with goggles on you can see it easily, im starting the BBB method after 2 weeks of using the pucks, got a TF-100 test kit in yesterday and it looks like everything is ok, except Ph might be a little high. any idea to what is causing this light brown-tan stain i'm seeing. thanks guys! (awesome forum btw)
TH 400
FC 5
PH 7.8-8.0
TA 120
CYA 50
TH 400
FC 5
PH 7.8-8.0
TA 120
CYA 50