The length of time water can sit in a pool without chlorine before becoming unsuitable for swimming depends on several factors, including temperature, sunlight exposure, water circulation, and the presence of contaminants. Chlorine is commonly used in pools as a disinfectant to kill bacteria, viruses, and other microorganisms that can pose health risks to swimmers.
In general, without the addition of chlorine or other disinfectants, the water in a pool can become a breeding ground for bacteria and algae within a relatively short period. In warm and sunny conditions, algae growth can occur within a matter of days, turning the water green and creating an unsightly environment. Bacterial growth can also become a concern, potentially leading to the presence of harmful microorganisms.
If a pool is left untreated without chlorine, it can become unsanitary and unsafe for swimming in as little as a week or even less under certain conditions. However, the exact timeline can vary depending on factors such as temperature, sunlight exposure, the presence of organic matter (leaves, dirt, etc.), and the initial water quality.
To maintain a safe and clean pool, it's generally recommended to regularly test the water chemistry and maintain appropriate chlorine levels. This helps to inhibit the growth of bacteria and algae, ensuring a healthy swimming environment.