Chemical Oxygen Demand (COD): the number that saves rivers
Chemical Oxygen Demand (COD) is one of the most important measures of water quality. It tells us how much oxygen is needed to break down organic and inorganic substances present in a sample. When COD values rise, rivers and aquatic life are at risk, and treatment plants face higher costs. Understanding what COD measures, where high results come from, and how to safely reduce them helps protect ecosystems, ensure cleaner tap water, and keep industrial processes under control.
