What is a common source of contamination in public pools?

Human waste and body oils represent a significant source of contamination in public pools because they can introduce harmful pathogens and increase the demand for sanitizing agents like chlorine. When swimmers enter the pool, they bring with them bacteria, viruses, and organic matter that can lead to water quality issues, including increased turbidity and the potential for waterborne illnesses.

Additionally, body oils can create a film on the water surface, which can inhibit chlorine's effectiveness by preventing it from reaching contaminants effectively. This combination of factors underscores the importance of maintaining proper hygiene practices among pool users, such as encouraging showers before swimming, to help minimize these risks and ensure a safer swimming environment.

Other sources of contamination, such as algae growth, dead insects, and leaves, while they can affect pool cleanliness and aesthetics, do not pose the same direct health risks associated with human waste and bodily fluids.