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I had gray blacking stains throughout the pool. I had water tested several times and no testing turned any reason up for the stains. The first year the pool was built i had a copper ionizer system. It was a nightmare. After having the pool acid washed , i switched to a salt system. All the...

That sounds similar to the LEMON test. I placed a lemon on stain for 15 minutes and nothing...

The stains did go away. Yes the old green stains were copper. The black stains appear like chalk marks but they don't rub off. According to pool store all chemistry was excellent.

I have tried every remover product on the market following the label directions. NOTHING BUT NOTHING is aiding in the removal. Last year I used the cl free system. Had several large stains and green stains. Had pool emptied and acid washed. Changed to a salt generator and now the staining is...