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Hi all. 20k gallon in ground pool, 8 year old vinyl liner, nearly 30 years old pool 2 year old filter with zero sand. 4 year old variable speed pump. City water.

We have a 20k gallon vinyl lined in ground pool. For a year we have been battling staining. It tests nearly 0 for iron and copper and pool store insists it's manganese because we leave open in winter with heavily wooded yard. All of our chem levels are perfect after getting super high phosphates...