How to Tell If You Have Mustard Algae


Algae can be the bane of your existence if you are a pool owner and must be dealt with firmly after it is diagnosed. Your pool could have become infected from a variety of sources. Sometimes mustard or yellow algae develops through spores being introduced to the pool from improperly cleaned swimming suits or transmission by air or rain.

Things You'll Need

  • Pool net
  • Plastic cup
  • Look for debris in the pool that looks like sand or dirt.

  • Note where the suspected algae is in the pool. Mustard algae is often found in the shady side of the pool.

  • Determine whether the debris is sand or dirt by attempting to catch some with the pool net. You might have to resort to using a plastic cup to collect some of the material.

  • Examine the debris closely to determine the color. Mustard algae will have a distinct yellow tint, whereas sand or dirt will be more tan or brown.

  • Look for cloudiness in the water. This combined with yellow growth signals mustard algae.

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  • Photo Credit swimming pool image by apeschi from
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