Why do swimming pools need to be replenished with fresh water every day?

Some people maybe think it doesn't need to change the swimming pool water because they have equipped the swimming pool disinfection system and chemical system. This idea is wrong and dangerous.

Swimming pools cannot simply be disinfected without changing the water. However, changing the water every day is also impractical. This is because daily water changes not only consume time and waste water resources but also incur significant costs.

The solution is to add a certain proportion of fresh water daily to ensure that indicators such as residual chlorine, pH value, and turbidity meet standards.

**Removal of organic contaminants such as urea: 

Sweat, urine, and skin flakes brought in by swimmers can accumulate urea. Excessive urea can react with disinfectants (such as chlorine-based agents) to produce irritating substances (such as chloramines), affecting health.

1, Compensation for evaporation and runoff losses:

During daily operation, water is lost through evaporation, splashing, and runoff, requiring timely replenishment.

2, Maintaining disinfection effectiveness: 

Long-term use of chemical disinfectants can cause water quality to "age," reducing disinfection efficiency. Fresh water can dilute residues and restore the effectiveness of the disinfectant.

3, Meeting hygiene standards:

National standards clearly require daily replenishment of fresh water to ensure that indicators such as residual chlorine, pH value, and turbidity meet standards.

How much fresh water is needed?

For example, at our country stipulates that outdoor public swimming pools should be replenished with 10%-15% of their volume of fresh water daily, indoor swimming pools should be replenished with 5%-10% of their volume of fresh water daily, and children's pools should be replenished with 15%-20% of their volume of fresh water daily.