What is the main source of disease-causing organisms in pools?

The primary source of disease-causing organisms in pools is the bathers themselves. When individuals enter a swimming pool, they can inadvertently introduce various bacteria, viruses, and parasites into the water. These organisms can originate from skin, bodily fluids, and waste, including fecal matter. Proper hygiene is essential for swimmers to minimize this risk, which is why it is often emphasized that bathers should shower before entering the pool and avoid swimming when they are ill.

While water chemistry, inadequate filtration, and environmental factors can contribute to the overall health and cleanliness of pool water, they do not serve as the direct source of pathogens. Instead, maintaining correct water chemistry and ensuring effective filtration systems are crucial for controlling and mitigating the harmful effects introduced by bathers. This highlights the importance of educating pool users on personal responsibility for pool hygiene to maintain a safe and healthy swimming environment.