Steripen Water Bottle Pre-Filter

This Pre-Filter fits the openings of Nalgene® and comparable wide-mouth water bottles to filter particulates and debris from water. Use the pre-filter to provide clear water, which in turn can be purified using the SteriPEN™ Water Purifer or other purification methods. Pre-filter screen has a square aperture equal to 17 square microns. Replacement cartridges available. .