What is the acceptable range for free chlorine using a DPD test?

The acceptable range for free chlorine using a DPD test is typically between 1 and 5 parts per million (ppm). This range is vital for maintaining proper water quality in swimming pools, as free chlorine serves the essential role of disinfecting the water by killing harmful microorganisms and algae. Levels below 1 ppm may not sufficiently protect against bacteria and pathogens, while levels above 5 ppm can lead to chlorine irritation for swimmers and may also affect the balance of other water chemistry parameters.

Maintaining free chlorine levels within this range ensures that the pool water is both effective for disinfection and comfortable for users. Regularly testing the free chlorine levels helps pool operators manage the chemical balance and ensure a safe swimming environment.