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The SteriPEN FitsAll Filter has a 40 x 40μm mesh screen which filters out particulates from your drinking water. It is designed for use prior to sterilising water with a SteriPEN UV purifier.
The FitsAll Filter is uniquely designed so that it can be used with bottles having a range of mouth sizes; this includes commercial water bottles, wide mouth canteens and SIGG bottles. On wider mouth bottles only the top part of the funnel is used, whilst both parts need to be connected together for bottles with narrower mouths.