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It was from the pool store. I thought it had copper, but when i checked just now, it says free of metals

Yes, i used algaecides a couple of times this year and also phosphate removers last month in addition to slamming

I seem to have black/brown patches on the side walls. The water itself is crystal clear. I see these patches for some time now and slamming doesn't seem to help. I'm not sure if its black algae or the surface itself is damaged. Attached some pics here of the walls. Any thoughts on how...

I tried and it doesn't brush away.

The water is crystal clear. However, i have this algae that kind of looks like rings (see attached pictures). Any thoughts on what it is and how to treat it?