So we just bought a house a month ago and are completely new to having a pool. At first I thought this was staining so we recently tried ascorbic acid to see if it would lift stains in a spot that we tested and it seemed like it did lighten it some. So we went all in on a full Ascorbic acid treatment. I do feel like some places lightened up slightly but these dark patches and streaks are still so prominent. Could this just be mottling? I don’t know much about the care that the previous owners gave to the pool but I’m thinking it’s not a lot
The pool is only about 4 years old and it has pebble tec finish.