I am hoping this is the right place to post this. Please move if appropriate.
So since I now have my basic day-to-day maintenance covered and the pool seems to be remaining rather sparkly, I want to start tackling some of the other issues. One of the things about having such clear water is that it makes it easy to see stains. It would seem that the entire surface of the pool is covered in what appear to be these irregularly shaped stains. They tend to be bluer lines, with browner lines outside them. They aren't 'in your face' kind of stains (though I do have a few of those which I suspect are rust spots) but they seem to make the pool appear more dingy. Pictures attached are taken of what was on the steps. I am looking for some thoughts on what they might be and how to address them. The pool is plaster, approx 20 years old. Previous owner seemed to be using pucks. PH and CYA were very high when we opened the pool in May.
I have tried brushing the stains but it doesn't help. Speaking of brushing, when I do brush (using a stainless bristle brush) I get a fair amount of substance off of the pool surface that cluods the water for a bit and disappears. is that normal? How often should I be brushing the pool walls and bottom?
Also, disregard the stain marks in the upper left of the second photo. They came from a pump I set there when pumping the pool out. I am interested in the general staining that is seen over all of the plaster.