I have brown stains all the way around my pool. I first thought that because my pool is 12 years old that We might have to have it replastered, but after seeing some of the problems others are having, I decided to have the water tested for metals. I took a sample to Leslie's and sure enough the copper was at .6 and the iron was at .1. I bought the stain remover and then one hour later added the metal free. I haven't been able to see any of the stains disappear. What to do next? I've included a picture. Thanks!