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Vinyl Fungus (Vinyl Plague)
Vinyl fungus, sometimes referred to as the vinyl plague, is a phenomenon where soil fungus grows through the outside of the liner into the pool. It often appears as a dark stain originating from a central point on the bottom of the liner.
This unique problem for vinyl liners is most prevalent in areas of high water tables. The fungi prefer dark, damp, cool environments – making the bottom side of a liner a perfect habitat.