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What is Mustard Algae in swimming pools?

Mustard algae is also called yellow or yellow-green algae.  Mustard algae spores are very small, and easily pass through filters and spread into the entire swimming pool system.

Mustard algae can grow in swimming pools that have insufficient sanitation and lack of consistent doses of algaecide added to the pool water.  Without proper pool maintenance, the algae easily grows and can become difficult to control once it has an established presence.  Even in a properly chlorinated pool, mustard algae can still appear if algaecide is not added at regular intervals.

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If mustard algae is present, the swimming pool walls and floors should be scrubbed with a pole brush to reach deep areas, breaking the natural defense layers of the algae.  A shock treatment should then be applied and allowed enough time for the shock to oxidize all organic contaminates, including the algae bloom.  An aggressive algaecide dose should them be applied to prevent future mustard algae from appearing.  If any growth areas remain, they should be physically removed using a firm brush and gently scrubbing as to not damage pool surfaces, but hard enough to remove the algae growth.  .

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