How often should the water in the swimming pool be changed

It is generally recommended to replace the water in swimming pools every 3-7 days, and the specific frequency is affected by factors such as the number of users, water quality monitoring results, filtration system efficiency, environmental temperature, and disinfection methods.

1. Number of users

Swimming pools that are frequently used need to shorten the water change cycle. Sweat, dandruff, and residual cosmetics brought in by the human body can accelerate the deterioration of water quality. Public swimming pools may need to replenish new water daily and strengthen filtration during peak summer periods. If the number of users of a family swimming pool is small, it can be extended to 7 days for replacement.

2. Water quality monitoring

uses tools such as residual chlorine testing and pH value detection to determine changes in water quality. When the residual chlorine is below the standard or there is turbidity or odor, even if the predetermined cycle has not been reached, the water needs to be replaced immediately. The automated monitoring system can more accurately indicate the timing of water change.

3. Filtration System

Swimming pools equipped with high-efficiency sand tank filtration or diatomaceous earth filtration can extend the water change interval to 10-15 days. But it is necessary to regularly backwash the filter material to avoid impurities accumulating and affecting the filtration effect. Simple filtration devices require more frequent water changes.

4. Environmental Temperature

High temperature environments can promote algae growth and chlorine volatilization. It is recommended to replace some water bodies in outdoor swimming pools every 2-3 days when the temperature is above 30 ℃. The constant temperature indoor swimming pool maintains a relatively long water quality due to its stable temperature.

5. Disinfection Method

Swimming pools that use ozone or ultraviolet assisted disinfection can reduce the use of chlorine agents and slow down the accumulation rate of organic matter. Traditional chlorine disinfection requires regular over chlorination treatment, otherwise irritating chloramine compounds may be produced.

In addition to regular water changes, the circulating filtration system should be operated 24 hours a day to remove floating debris from the water surface and replenish consumed disinfectants. Swimmers should take a shower before entering the pool to avoid carrying external pollutants. For children's swimming pools or rehabilitation training pools, it is recommended to increase the frequency of water changes to ensure hygiene and safety. Water quality maintenance requires a combination of chemical testing and physical cleaning, and changing water alone cannot solve all pollution problems.