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Posted by beaglebarbara 4 years ago In:

beaglebarbara
beaglebarbara Asked:

What causes mustard algae in swimming pools and how do you get rid of it?

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dobbin
dobbin Answered:

Hi

Mustard Algae" is probably the MOST misdiagnosed form of algae.  Mustard algae  is a chlorine-resistant form of green algae (yellow-green to brown in color)  typically found in sunbelt areas. It often resembles dirt or sand on the bottom or sides of a pool. When trying to distinguish between mustard algae or dirt, follow this common sense rule of thumb: if it feels gritty it's dirt; if it has slimy feel it's mustard algae. Mustard Algae has certain characteristics: It can be brushed away very easily, but returns quickly to the same location. Keep in mind that the "algae" may be returning to the same place due to a dead spot in the pool. 

Although it usually creates a large Chlorine demand, it has been known to survive in high levels of Chlorine.  It is extremely important to remove mustard algae growth from equipment (including the back of underwater lights & ladders) and bathing suits to avoid cross or recontamination of other pools. Pool equipment can be left in the pool during product application or cleaned separately with a mild cleaning solution. Rinse thoroughly if equipment is used in a SoftSwim® pool. Bathing suits should be washed with detergent as directed on garment label.

Treatment:  Have water properly analyzed. BALANCE THE POOL WATER. Prior to and during treatment, the algae MUST be thoroughly brushed in order to "break open" the slime layer.  Failure to do this critical step will prevent the treatment from working.  Pools treated with chlorine or bromine should aggressively shock with chlorine.

I hope this helps.  (Courtesy of Par-pool spa)

Regards

Sean

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