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‘Angular’ stains are distinct from the smears or sheets associated with stains caused by water chemistry because they are caused by chemical reactions BEHIND the Fiberglass shell.

Likely Causes:
  • Poor Construction/workmanship. Fiberglass may be too thin in places resulting in oxide leaching from rusting metal reinforcing behind the shell.
  • Low quality RESIN used when glass was laminated in construction of the shell
  • Age of the shell

Consult a reputable pool renovator.