Young Brunette Girl At The Swimming Pool

Sanitation
Swimming pool water must maintain low levels of bacteria and viruses to prevent the spread of diseases and pathogens. Bacteria, algae and insect larvae can enter the pool, if water is not properly sanitized. Pumps, mechanical filters, and disinfectants are often used to filter the water.
Chemical disinfectants, such as chlorine and bromine, are commonly used to make water resistant to pathogens. If not properly maintained, chemical sanitation can produce high levels of Disinfection byproducts. Sanitized swimming pool water can theoretically appear green, if iron or certain minerals are in the water.