Natural filtration is a process where water is purified through natural materials and ecosystems. This can occur in environments like wetlands, where plants and soil work together to remove impurities and pollutants from water. The natural filtration process helps maintain clean water sources and supports biodiversity. Another example of natural filtration is the use of sand and gravel in aquifers. As water passes through these layers, contaminants are trapped, allowing cleaner water to emerge. This method is essential for replenishing groundwater supplies and ensuring safe drinking water for communities.