I thought that what I had were mineral stains, because after placing a puck on them, they didn't budge. But now I'm starting to wonder because they have gotten a TAD lighter since I increased my chlorine level. The previous owners didn't cover the pool during the winter and it was a MESS this year when we started out.
Does this look organic?
Ugg...they're so ugly! There are so many of them that they really keep our water from looking its best.