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It could be copper. If so , what do I use to get it off? I have a copper ionizer that was used in the pool. I also have a heat pump that has copper piping in it. So copper is a possibility, although the other sources I have found claim that copper stains tend to be light to dark blue. These...

I have yellow to dark brown stains on my vinyl liner. I lowered my pool water PH to 7.0, have no chlorine in the pool FC = 0 and added 1.5 lbs. ascorbic acid. Nothing happened. Put roughly 2 cups ascorbic acid in a sock, dropped it in, nothing happened. Used brush to move around sock, nothing...