Gravity-based water purifiers utilize physical filtration, including activated charcoal and sediment filters, to improve water quality. Activated charcoal effectively absorbs chemicals, organic compounds, chlorine, and unpleasant tastes and odors. However, this method does not remove minerals, sodium, or microbes such as bacteria and viruses, necessitating supplementary filtration for genuinely safe drinking water from contaminated sources. Regular replacement of charcoal is crucial as it can become saturated.