BioGuard SPA Defence prevents staining and water discolouration from metals, and scale build-up from excessive calcium.

Product Features

  • 133g/L organic phosphonates.
  • Prevents calcium and magnesium ions present in ‘hard’ water from precipitating out of solution.
  • Helps to prevent staining from metals like copper, iron and manganese.


  • Prevents scale build-up.
  • Helps keep spa water clear.
  • Removes some fresh metal stains.
  • Protects spa surfaces.

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