We bought a house that came with a pool in March. In the deep end mostly, there were several rust-like spots on the bottom, BB size. Today I noticed one on the side of the pool, about a foot from the surface, so I'm ruling out actual things left in the pool to rust.
My questions, any idea what this is?
Should I try Vitamin C?
From what I understand, pebble tec is about 6 years old.
I tried taking pics, but will not turn out clear.