I also used tap water to fill and I've had a few streaks, which look like iron, and a patch in the middle of the shallow end that looks like dirt but I can't brush it out. Also, the plaster doesn't look as clean overall as I think it should. It's less than 6 months old.

My levels are all good and the water is sparkling. I did use a bottle of "d-iron" which was left over from my friends at the pool store last year. It didn't help much. But I didn't intentially let me chlorine drop first.

I'm wondering whether I should do the same thing vgg659 did?