Hey guys, pretty much done slamming my pool from a green algae mess. I am a new pool owner and was pool-stored for a few months. Last time I was in, they said I had copper in my pool (2.1 ppm at that time). I ignored this problem and finished the SLAM first. I have not done my own testing yet for metals but am looking into buying test strips. In the case that there IS copper in my pool water:
1. Is the pool safe to swim in without using any sequestering agent?
2. What kind of "stains" should I look out for that indicate that there is metal in my pool? Here's a picture of the shallow end that have this discoloration on the floor. Not sure if that is a factor of metal or high fc when shocking? Sorry if it's hard to see.

1. Is the pool safe to swim in without using any sequestering agent?
2. What kind of "stains" should I look out for that indicate that there is metal in my pool? Here's a picture of the shallow end that have this discoloration on the floor. Not sure if that is a factor of metal or high fc when shocking? Sorry if it's hard to see.
