Enter the water in the upper water container. You can use tap water, well water or river water. Murky and Muddy water can be used by reducing the speed of filtration. Chemically contaminated or Salty water can not be used. As a rule of thumb, all water that can be consumed after boiling can also be consumed after filtration. The sterile water flow into the lower container. From there you can tap the water and drink it directly, it is safe and free of bacteria.