I am a new pool owner and I have been having issues with metal. We noticed brown staining on all the white parts of our pool two weeks ago. We brought the water to Leslie’a to get tested and copper was .5 and iron was .2. So both were on the high side. They gave us No Metal plus a Stain Remover. On the stain remover is says to add it for an hour and then add the metal remover. And then run the filter for 24 hours. However, do I need the stain remover? Will the no metal also lift the stains? Do I have to run the filter for 24 hours? We were actually on vacation and some of the staining has gone away but not all. I have a 25k gallon vinyl in ground pool with a super old cartridge filter (no DE). Any advice would be appreciated!