Algae organisms constantly enter the pool, brought in by wind, rain, contaminated swimsuits or equipment. These conditions can also occur due to out of balance water, warm temperatures, sunlight and presence of nitrates. Of course, a lack of appropriate circulation, filtration and sanitation may be the principal cause of the algae growth in your swimming pool.

 Algae are living aquatic creatures that multiply rapidly on warm, sunny days. An algae contains chlorophyll and uses photosynthesis to grow. That is, they take in carbon dioxide and give out oxygen in return.