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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...

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...