image1.jpgHi all. These "stains" for lack of a better word have been present since I bought the house two years ago so I'm not sure how long they have been there. Here is the situation: my pool's plaster finish is a sand/tan color and so in the shallow end the water reflects little blue color but of course is more blue toward the deep end. Starting at about the 4' depth, there are these areas that look more blue and they continue in a random pattern to the deep end at 6 feet. Since my pool water has been so fantastically clear (thanks to everyone's help here at TFP ) it is noticeable.
It is not something that brushes off. It does not feel different to the touch.
I have no idea what may have caused this. Before me, the previous owners had a weekly service for the 8 years they had it (was built ten years ago). So who knows.
Attached is a pic - I don't know if the small resolution will show it here. I have others as well if it helps.