What is a common sign of algae growth in pool water?

A common sign of algae growth in pool water is the presence of a green tint or cloudiness. Algae are single-celled organisms that can proliferate rapidly under the right conditions, particularly when the pool water is warm and poorly maintained.

When algae begin to thrive, they can give the water a greenish hue, which is often one of the first visual indicators of their presence. Pool water that appears cloudy might also suggest an imbalance in water chemistry or inadequate sanitation, with algae as a potential culprit. This cloudiness can obstruct visibility and detracts from the overall aesthetic of the pool, creating an inviting environment for algae to continue to flourish if not addressed promptly.

The other options present characteristics that do not typically indicate algae growth. For instance, a foamy surface might suggest the presence of contaminants or chemical imbalances, clarity and bright color are signs of well-maintained water, and a strong chlorine smell usually indicates the presence of chloramines (a byproduct of chlorine) rather than direct algae issues. Thus, noticing green tint or cloudiness should prompt immediate action to test and treat the water to restore clarity and prevent further algae bloom.