How do people filter dirty water?

People filter dirty water using various methods to remove contaminants and improve its quality. Common techniques include using physical filters like sand or activated charcoal, boiling the water to kill pathogens, and employing chemical treatments such as chlorine or iodine. Additionally, some use specialized filtration devices or water purification systems designed to eliminate bacteria, viruses, and sediments. These methods can vary in effectiveness depending on the specific contaminants present in the water.