The Pure Clear 42mm Conversion Cap/Filter is a water filter that can be used as a replacement cap for the Collapsible Squeeze Water Filter Bottle, or it can transform any 42mm mouthed bottle into a water filter. Pure Clear says:The Pure Clear 42mm Conversion Cap is a UK first for bottle conversion protection againstbacteria, parasites, viruses, chemicals, trace pharmaceuticals, chlorine, heavy metals etc. It givesthe user the ability to screw this cap to any standard 42mm thread and turn their bottle into afilter bottle. As an example this product is compatible with Katadyns BeFree bottle, this meansthat even customers with existing products of competitors can be converted to the Pure ClearrangeOur VerdictThe Pure Clear 42mm Conversion Cap/Filter can be used as a replacement cap for the Collapsible Squeeze Water Filter Bottle, or it can transform any 42mm mouthed bottle, such as the Cnoc Vesica, into a water filter.The Pure Clear filters are unique in removing 99.9999% of bacteria and viruses. However, as you can not back flush them, the filters must be replaced after 200 litres/ every two months. – Reviewed by Ultralight Outdoor GearFeaturesIndependently Lab tested and BPA freeFilters 200 litres of waterIdeal for bottle upgrade protectionUltra small filterReduces plastic pollutionYour purchase makes a difference, for every product purchased Pure Clear Filters provides 1400 litres of pure, clean and safe drinking water to those that need it most.SpecificationsWeight:Dimensions:Included: Comes with 1x cap and 1x filterFilter life: 200 Litres = 400 x 50cl plastic water bottles. The life of the filter can be extended by drying out the filter and storing it after useMaterial & ConstructionMouthpiece: TPULid: PolypropyleneHelp & advice:The Ultimate Guide to Water Treatment and PurificationTime-Saver Guide to Water Purification

The Pure Clear 42mm Conversion Cap/Filter is a water filter that can be used as a replacement cap for the Collapsible Squeeze Water Filter Bottle, or it can transform any 42mm mouthed bottle into a water filter. Pure Cl