Berkey filters are water purification systems designed to remove a wide range of contaminants from drinking water. They use a combination of gravity and advanced filtration technology, allowing users to obtain clean water without the need for electricity. The filters can eliminate bacteria, viruses, heavy metals, and other impurities, making them suitable for both everyday use and emergency situations. These filters come in various sizes, catering to different needs, from personal use to larger family units. Berkey systems are popular among outdoor enthusiasts, travelers, and those seeking a reliable water source in areas with questionable water quality.