I think I may a major issue here. I have a fiberglass pool. Most of the season I've had a purple ring around the water level. The pool store told me to add Pool Perfect. My number seems fine, I've had some trouble keeping ph up, but everything else is good. I only use strips. This past week, something new has started. We had to have the pool repaired a few years ago. Where they repaired the pool, it's like you can see brush marks. All my fixtures have blue stains on them and so do several places along the wall and steps. The skimmer basket also has blu stains on it. Is my pool finish breaking down?