No, viruses are too small and pass through the filter. However, viruses are generally not a concern in the back country, you only need to worry about them in areas where human waste contamination is present. If this is the case, pre-filter with the trailshot, then treat for viruses with chemical (aquamira) or UV (steripen) to knock out the viruses as well. And don't forget to disinfect the trailshot when you get home, mix 6 drops of bleach in 1 cup water, then pump through the filter, let sit wet for 30 m before drying thoroughly.
Date published: 2017-12-28