Mustard pool algae is yellowish-green to brown in color and is a stubborn chlorine-resistant form of green algae that is more common in warmer southern areas because of the higher temperatures during the summer months. It can look like dirt sand or a stain on the bottom or sides of a pool and can even reside outside your pool in pool equipment, toys, floats.

To treat mustard yellow pool algae, follow these steps:

  • Disinfect your pool toys and floats with a disinfectant cleaner.
  • Move hoses and poles to the shallow end so they’ll be easily sanitized when you shock your pool.
  • Turn your manual vacuum cleaner filter to waste, not backwash and vacuum the algae out of the pool.
  • Test your pool’s water to ensure it’s in proper balance. Your pH levels should be between 7.4 and 7.6 and your alkalinity should be between 120 and 150 ppm.
  • Fill your pool up with water to compensate for water loss as you vacuum.
  • Manually brush the algae from your pool bottom and walls.
  • Shock your pool at dusk and leave your filter and pump running 24 hours a day until the algae is gone.
  • Add a a specialized algaecide such as Yellow Treat® following the label directions and allow it to work overnight.
  • Continue brushing and sanitizing your pool for the next few days.
  • Continue checking your pH and alkalinity levels after your final shock treatment to ensure the algae is gone and to make sure your pool water stays in balance.
  • After the pool water is clear, chemically clean the filter with a filter cleaner.

Our team of professionals at Osceola Aquatics will keep your pool crystal clear with pool supplies and service so you can swim and enjoy your backyard oasis! We are one of the most trusted Kissimmee Pool Service companies in Osceola County and are conveniently located at 1551 Kelley Ave, Kissimmee, FL 34744 or call us today 407-846-1430.


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