They look kinda orange in some spots and then some look like a lighter version...
I am very pro-active in maintaining FC levels and the water has never turned even a hint of green. I have also maintained a 0 - .5 CC, no higher and have only shocked it once when opening.
FC - 3.5
CC - 0
TC - 3.5
pH - 7.5
CYA - 40 (was 50 til my bro came over a few weeks ago plus it rained a.k.a. filled-up)
FC - 6.5
FC went to 2.5 that night with a 1 CC so I asked who was peeing in the pool (4 boys, 3 girls all day with a couple breaks in between) and the girls blabbed the boys out because the one said he had to go and my son told him to do it in the pool so I don't even want to imagine if all the boys were doing it but my test results kinda confirm my suspicions that they were!
I brought it up to shock level last night after hearing such a thing! *faint*
Two hours after shocking, I got an FC of 15.5 with a .5 CC.
This morning, checked it at 10:30 am (4 1/2 hours after sunlight hit pool) and got an FC of 12 with a 0 CC reading.
My water has always been sparkly but I've had these spots appear in the last few weeks.
There are 2 directly above the dark one and one off to the right and those look to have hollow centers...
They reside on the wall on both sides of the skimmer (shady side in afternoon) and I have one spot on the other side (where I'm standing which is the shady spot in the morning)
Yellow spot here is my dd's goggles she left in over night...
Pool temp has been in 78-80 range most of summer. (I filter at night and do not use a solar cover at all.)