White Water Mold


What it is & what it looks like:

  • A naturally occurring fungus (this is NOT a form of Algae; it is animal not vegetable).
  • A white mucous or tissue paper-like substance frequently described as "noodle like".
  • Forms a heavy, protective coating providing the organism with an unusually high level of protection that is very resilient against halogen-based (chlorine, bromine) & non-halogen sanitizers or germicides.
  • Water mold thrives on the surface of PVC plastics including pipes & plumbing lines & air bubbler/blower lines
  • Can re-contaminate long after it appears that it has been destroyed
  • Small quantities can lead to a re-establishment of the problem
  • Caused by improper water & pool maintenance, environment, poor circulation
  • Prefers areas that are "dark" (not exposed to direct sunlight) & with "slow moving" water
  • Tends to be more common when using biguanides (soft swim, baquacil, etc.), and ofter starts or is heavily visable in ozone lines.


Prevention of "white spa mold" is preferred over treatment. Follow these steps to help prevent white water mold:

  1. Physically wipe & clean ALL spa & hot tub surfaces weekly, including recesses around all jets & underneath pillows.
  2. Expose ALL spa surfaces to as much sunlight as possible (sunlight & UV are natural oxidizers).
  3. When the water is changed use Spa System Flush or Swirl Away to break-up any build-up of bio-film in the pipes.
  4. Regularly add oxidizing chemicals into the skimmer to purge & clean the filtration lines of any bio-film.
  5. When adding make-up water from the garden hose, allow the water to run for 2 to 3 minutes before putting the hose into the spa.
  6. Regularly clean spa toys & floats.
  7. Regularly clean floating blanket and/or the underside of your cover.
  8. Chemically clean filter every 3 to 4 times a year.
  9. Add regular Maintenance dosages of "Shock".
  10. Run the filter a minimum of 6 hours daily to prevent "dead spots" in the water's circulation.
  11. Remember to clean & rinse the brushes, hoses & vacuums that you use to clean your spa.
  12. Keep the water balanced at all times. Recheck after heavy usage or rain or large "top-offs" of new water. Test the water at least 2 to 3 times per week.  Water balance refers to Free Available Sanitizer level, pH, Total Alkalinity, Calcium Hardness.


Treatment of "white water mold" MUST BE QUICK AND TOTAL! DON'T SKIMP!

  1. Clean all affected surfaces as prescribed above.
  2. Use a plumbing cleaner such as Spa System Flush or Swirl Away to break-up any build-up of bio-film in the pipes.
  3. Physically clean & remove all visible "white water mold".
  4. "Shock" the water with a triple or quadruple dose of sanitizer.
  5. Run filter 24 hours daily until water is clear & chlorine or bromine levels are maintained at a "higher" level.
  6. Chemically clean the filter.
  7. Maintain good water balance of pH, Total Alkalinity & Calcium Hardness

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