Why do I need a filter or purifier?

All surface waters have the potential to be contaminated with at least one of the three types of disease-causing microorganisms: protozoa, bacteria, and viruses. While it is true that you can drink directly from many water sources, it is critical to understand that each time you do, there is a chance of ingesting one of these bugs. Infection symptoms can range from an upset stomach to debilitating illness and, depending on where you are, can mean anything from a simple inconvenience to a life-threatening situation. Since microorganisms are impossible to see, taking the proper precautions with any water can help to ensure a safe trip.