How to Treat White Water Mold in Swimming Pools

Does your pool look like it was filled with shredded tissue paper? Then your pool has "white water mold". Despite the name, this is actually a type of algae that is closely related to mustard algae. In this article we show you how to get rid of it fast so you can go back to swimming.

At a Glance







Add Swamp Treat™

Add one (1) bottle of Swamp Treat™ per 20,000 gallons of pool water. 



Brush the surface of the pool, concentrating on areas with the most mustard algae. One good push of the brush over an area should do the trick.



Shock the pool with your choice of chlorine – using about 2 pounds/gallons of chlorine per 10,000 gallons of pool water. Refer to the directions on your chlorine for “superchlorination” specific dosing.



Let the filter clean up the dead white water mold, and backwash the filter when the pressure gets high. Refer to the filter manual for back-washing recommendations.

What You’ll Need

  • Swamp Treat™ Rescue Algicide
  • Brush Attachment
  • Pool Shock of your choice

Extra Tips

  • Check the filter pressure every few hours and backwash as necessary. Your filter may clog quickly depending on how much white mold you have.
  • Keep your filter running continuously to help get rid of the algae.
  • Backwash your filter when the filter pressure rises above 10 psi than normal.
  • Don’t pour shock directly on colored surfaces. This can discolor your surface.

Still need help?

Still have questions? Need an expert’s advice? Visit our support center for additional documentation and to open a ticket with a Pool Technician.

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