When clear water is not available, use the Water Bottle Pre-Filter by SteriPEN. The Pre-Filter filters out particulates and debris and fits most wide-mouth water bottles.

When in use, pour water through the durable 40×40 micron screen filter cartridge to fill the bottle. Then you’re ready to purify the water with a Steripen UV water purifier. Remove the filter cartridge from the Pre-Filter, insert the Steripen into the center of the filter, flip the bottle, and agitate the water until the Steripen indicates the treatment is complete.

SteriPEN Water Bottle Pre-Filter Features:

• Filters larger particles from river or lake water
• 4 micron screen
• Attaches to most wide mouth water bottles
• Pour water in, or submerge bottle to fill through filter
• Full instructions included

SteriPEN Water Bottle Pre-Filter Features:

Dimensions (in): 2 x 3
Weight (oz): 1