Ok, I wanted to start this new thread in this forum, I just finished a 2 month battle turning my green pool into crystal clear water. All of that adventure is posted under water testing. My question here is, during the cleaning of the green water I used some algecide with copper in it, the finishing touch of getting my water clear was that I used floc. It took 2 attempts but worked great, I was able to vacuum the debri off the floor to waste. I was then able to filter what little was left with the help of DE in my sand filter. I noticed a few dark stains after getting the pool clean, I figured organic stains, but this morning I tried some vitamin c crushed up in a sock and it was coming up rather easy. So I guess its metal stains. It looks to me that the stains are covering more and more of the pool bottom, is it possable for them to spread? Or could it be metal in the water just now releasing to pool surface, and if so what would have caused that to happen after I got it cleaned? If I was to got he route of using crushed vitamin c in a sock to wipe them up, how long do you think it would be before it would settle back down as a stain. I understand I can go the ascorbic acid treatment, but getting this pool clean has put a hurtin on my pocket lol. and my guess is I`m looking at close to 75$ to do this treatment?