The Steripen Pre-Filter fits on wide-mouth water bottles and filters out particulates and debris before treatment with a Steripen.
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 UV water purifier. Remove the filter cartridge from the Pre-Filter, insert the SteriPEN into the centre of the filter, flip the bottle, and agitate the water until the SteriPEN indicates the treatment is complete.
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