SteriPEN SP-PF Water Bottle Pre-filter
When clear water is not available, use the Water Bottle Pre-Filter by SteriPEN. The Pre-Filter filters out particulates and debris. Fits on Nalgene® and wide-mouth water bottles (Does not fit Klean Kanteen Wide). Filters out particulates using a 40 X 40 micron size nylon mesh filter.
In order for ultraviolet (UV) light to effectively disinfect the water, any particulates, turbidity, or sedimentation need to be removed from the water.SteriPEN Water Bottle Pre-filter User's Guide