What type of algae is most commonly found in swimming pools?

Green algae is the type most commonly found in swimming pools due to several factors related to its growth conditions. This algae thrives in environments with high nutrient levels, particularly when there is insufficient sanitation, low chlorine levels, or inadequate water circulation. Green algae often appear as a greenish film on pool walls and surfaces, and can quickly proliferate if not managed properly.

Its visibility and rapid growth make it a common concern for pool operators who must maintain proper water chemistry and cleanliness. Addressing nutrient levels and ensuring adequate filtration and sanitation are essential steps to control green algae growth, making it a central focus in pool maintenance training.

Other types of algae, like red, blue-green, and yellow algae, do exist but are less commonly encountered in typical swimming pool environments.