The 24-ounce GeoPress water purifier bottle makes it fast & easy to ensure you’re drinking clean, safe water anywhere in the world—even if your only source is seriously suspect. Fill up the outer bottle & press down on the top with the filter bottle using your body weight. This forces the water through the filters which eliminate sediment, viruses, bacteria, protozoa, heavy metals & microplastics. What you get is clean in 8 seconds. It’s also portable.