The absence of measurable chlorine available to sanitize swimming pool water indicates a condition where the pool’s water is not adequately disinfected. For example, a test reading of zero parts per million (ppm) of free chlorine signifies that the chlorine present has been fully consumed, leaving the water vulnerable to bacterial and algal growth.
Maintaining adequate sanitization is vital for bather safety and preventing the spread of waterborne illnesses. A failure to do so can lead to unsanitary conditions, necessitating immediate corrective action and potentially impacting public health. Historically, chlorine-based sanitizers have been the primary method of pool disinfection, and their effective concentration is considered a key indicator of water quality.
