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Algae spores, phosphates, nitrates, pool filtration, locked chemicals and more, all can contribute to making a pool green and problematic.    We can help with your green and problem pool. 

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Talk to our team today to better understand your swimming pool, the sanitation requirements and the overall maintenance and PREVENTION OF PROBLEM POOLS.

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Green pool
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Mustard Algae

Or Call us Direct     0432 105 352

Possible Causes of a Green Pool
  • Improper circulation

  • Poor filtration & pool care

  • Surrounding vegetation

  • Poor sanitation

  • Water chemicals out of balance

  • Presence of phosphates

  • Locked chemicals - chlorine lock

  • Presence of nitrates or carbon dioxides



  • Properly balance your chemicals

  • Maintain sanitisation

  • Remove phosphates

  • Clear out excess surrounding vegetation / organic material

  • Improved pool care

  • Improved equipment maintenance



Did you Know... ?

Black algae not only forms on the pool walls but embeds itself deeply into the pool substrate, making it resilient to standard treatments.

Its deep-rooted structure makes it challenging to eradicate completely, requiring vigorous treatment methods to reach and eliminate embedded spores.

There are over 20,000 known varieties of algae, each with its own characteristics and specificities.

Relevance: While only a handful of algae types commonly affect pools, the vast diversity highlights the adaptability and range of potential algae-related issues.


Algae is the most prevalent visible problem in pool water due to its conspicuous appearance.

Its visibility often leads to prompt recognition and treatment compared to other less visible pool water problems, contributing to its status as the most common pool issue.


Types of Algae

Green Algae:

  • Commonality: Green algae is widespread and typically the easiest to treat among different algae types.

  • Appearance: It appears as a greenish hue on pool surfaces, often forming in patches.

  • Treatment: Regular sanitation and shocking the pool with chlorine can effectively eliminate green algae. Brushing and vacuuming the pool, along with maintaining proper chlorine levels, help prevent its recurrence.

Yellow / Mustard Algae:

  • Challenges: Yellow or mustard algae can be troublesome to treat and often more resistant to standard chlorine treatments.

  • Appearance: Usually manifests as yellowish or mustard-colored spots on pool surfaces, particularly in shady areas.

  • Treatment: Requires a more comprehensive approach involving higher chlorine levels, brushing affected areas, and using specialized algaecides specifically designed for yellow algae. Regular scrubbing and maintenance are essential to prevent its return.

Black Algae:

  • Difficulty: Black algae is notorious for its resistance and ability to embed itself into the pool walls, making it difficult to eradicate.

  • Appearance: Forms as dark, black spots with a hardened outer layer that protects it from chlorine and other treatments.

  • Treatment: Removal involves aggressive brushing to break the protective layer, followed by direct application of concentrated chlorine or specialized algaecides. Persistent treatment and ongoing maintenance are crucial to completely eliminate black algae.

Pink Algae (Paecilomyces Lilacinus):

  • Nature: Contrary to its name, pink algae is not algae but a fungus called Paecilomyces Lilacinus.

  • Appearance: Often mistaken for algae due to its slimy white, pink, or grey colonies forming in pools.

  • Treatment: Requires different approaches than typical algae treatments. Using fungicides or specialized treatments targeting fungi is necessary to eliminate pink algae. Thorough cleaning and maintaining balanced pool chemistry can aid in preventing its growth.

Each type of algae or fungus requires a specific treatment approach tailored to its characteristics. Regular cleaning, brushing, proper chemical balance, and prompt treatment upon detection are essential for effective algae control and prevention in pools



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