How do natural filters work?

Natural filters, such as wetlands, forests, and soils, work by utilizing biological, chemical, and physical processes to remove impurities from water and air. These ecosystems trap sediments, absorb pollutants, and break down harmful substances through microbial action. For example, plants and microorganisms in wetlands can filter out nutrients and contaminants, while soil layers can adsorb and degrade pollutants. Thus, natural filters play a crucial role in maintaining environmental health and water quality.