No other portable water filter can match the efficiency of Grayl Geopress Purifiers. In just 14 seconds, 710 ml of clean drinking water is produced. Anywhere in the world. Whether your water source is a hotel, a river, a lake, or a well, drinking water is guaranteed. The Ultralight Purifier protects against global pathogens such as viruses, bacteria, protozoan cysts, pesticides, chemicals, and even microplastics.