SteriPEN Camp & Hike Prefilter Water Bottle Attachment SPPF. Then you're ready to purify the water with a Steripen UV water purifier. Remove the filter cartridge from the Pre-Filter insert the filter into the center of the filter flip the bottle and agitate the water until the Steripen indicates the treatment is complete.
Current Retail: $12.95-$16.95
Historic Range: $7.49-$18.81