I went through this same thing over the weekend.
Thought it was algae that kept growing in the same spots
Turns out I have a lot of small divots in the liner, on the bottom of the pool. I am thinking they formed over the winter.
Dirt was collecting in them as the water circulated around. With a little more dirt being added each day, it looked like algae growth
Finally just kept vacuuming this past weekend until I got rid of it.
Bookmarks