Because the penetration of Ultraviolet (UV) light can be limited by debris, it is important that water be clear prior to SteriPEN treatment. Threaded for screw-top connection to the top of your Nalgene water bottle, the SteriPEN Water Bottle Pre-filter easily and efficiently removes particulates and debris, allowing the UV light of your SteriPEN to effectively treat water.
SteriPEN part number: SP-PF