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SteriPEN FitsAll Flter
The SteriPEN FitsAll Filter effectively removes particulates from water with the use of a durable 40×40 micron screen. As the name suggests this works on a range of different sized bottle necks from small water bottles up to Nalgene. It is designed to act as a filter before using one of the SteriPEN water purifiers to make water suitable for drinking. If particles are present in the water the effectiveness of the SteriPEN is greatly reduced.