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For a SteriPEN to work, the light needs to be able to get to all of the water particles. Cloudy or dirty water could inhibit how effective the UV treatment is. The SteriPEN Pre-Filter is a compact water filtration device that removes debris from water so the UV light can effectively destroy the microorganisms in it.
The thread on the Pre-Filter is common to most types of outdoor hydration brands and products such as Nalgene, Camelbak bottles and MSR Dromedarys
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Mountain Equipment acknowledges the Traditional Custodians of the lands our stores are located on as well as the trails we hike, the crags we climb and the places we adventure.
We pay our respect to the Elders, past, present & emerging.
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