Hydro Photon SteriPEN Water Bottle Pre Filter

Water Bottle Pre Filter is to be used with the SteriPEN Ultraviolet Water Purifier SKU 69478. When clear water is not available, use pre filter until water is clear, then treat with SteriPEN. For use only with Nalgene 32 oz. wide mouth bottles. Removes particulates and protects against water bottle recontamination. Easy storage on bottle, and creates a water tight seal when used properly with the SteriPEN Water Purifier. Size: 2.7 diameter. Weight 1.5 oz.