- 1). Look for debris in the pool that looks like sand or dirt.
- 2). Note where the suspected algae is in the pool. Mustard algae is often found in the shady side of the pool.
- 3). 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.
- 4). 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.
- 5). Look for cloudiness in the water. This combined with yellow growth signals mustard algae.
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