Water purification removes contaminants to make water safe for drinking, cooking, and various industrial uses. It combines multiple physical, chemical, and biological processes—such as filtration, sedimentation, disinfection, adsorption, and reverse osmosis—to remove particles, microbes, organic matter, heavy metals, and harmful chemicals while aiming to preserve essential minerals and maintain acceptable taste. Selecting, sizing, and routinely maintaining the right treatment systems depends on the water source, the intended use, applicable regulatory requirements, and regular quality testing to ensure consistent performance and protect public health.