What is the primary cause of algae growth in swimming pools?

The primary cause of algae growth in swimming pools is insufficient sanitizer levels. Sanitizers, such as chlorine or bromine, play a crucial role in maintaining water quality by killing bacteria and preventing algae from thriving. When sanitizer levels drop too low, the pool water becomes an ideal environment for algae to proliferate. Algae can quickly multiply, leading to cloudy water, slippery surfaces, and unsightly green or yellow patches.

While other factors, like high pH levels, can impact the effectiveness of sanitizers, they do not directly cause algae growth. Similarly, excessive filtration and low water temperature are not conducive to the conditions that promote algae. It is important for pool operators and owners to regularly monitor and maintain proper sanitizer levels to prevent algae blooms and keep the pool water clean and safe for swimmers. This includes testing the water frequently and adjusting the sanitizer as needed based on bather load and environmental conditions.