I have the Frog Mineral system for my inground pool and when I opened it this year, my local pool supply tested for copper and it was 3.0, there are no visible stains, water is clear.

I've tried Metal Free, didn't work. Drained about a foot and hall of water and replaced it with fresh water and that hasn't worked either.

I've read that mineral system tend to add copper to the pool along with the algaecide that I use twice a year.

My question, is this an acceptable level given the mineral system I use?

Thanks,