Is Polar Pure harmed by freezing?
No. The effectiveness of Polar Pure is not altered by freezing. However, once filled with water, it is important to protect the bottle from freezing. The bottle could crack due to expansion of the liquid inside when frozen. If you are hiking in freezing conditions, keep your bottle of Polar Pure in an inside pocket close to your body or with you in your sleeping bag. Store your bottle of Polar Pure where it will not freeze between uses. You may empty the bottle when not in use if you prefer but it is best to have it filled and ready to use.
