Which measurement is essential for determining pool water's redox potential?

The correct measurement for determining pool water's redox potential is ORP, which stands for Oxidation-Reduction Potential. ORP is a crucial indicator of the sanitization level of pool water, reflecting the overall ability of the water to oxidize and reduce substances, including contaminants and pathogens.

Redox potential is specifically measured in millivolts and indicates the balance between oxidizing agents (such as chlorine) and reducing agents (like organic matter) in the water. A higher ORP value typically signifies a more effective disinfection level, meaning the water is better at breaking down harmful organisms. By monitoring ORP, pool operators can gauge the effectiveness of the water treatment system and ensure safe swimming conditions.

While pH is important for maintaining water balance and affects the efficacy of chlorine and other disinfectants, it does not directly measure the oxidizing or reducing potential of the water. Total Dissolved Solids (TDS) indicates the concentration of various dissolved substances in the water and can influence water quality but does not directly correlate to redox potential. Calcium hardness pertains to the levels of calcium in the water, relating primarily to scale formation and corrosion potential, rather than its redox properties. These other measurements provide valuable information about water chemistry but do