For use in the Aquamira Sport Filter Bottle or any Nalgene Sport bottle. No need to purchase an entire system when your Aquamira Water Bottle Filter is exhausted. Just drop in a new Aquamira replacement filter. A single filter treats up to 100 gallons. Provides a safe and effective way to enjoy clear, clean tasting water anywhere. Filters are small, lightweight and inexpensive. A necessity to include with a sport bottle in your emergency preparedness supplies.