What about freezing? Once you have used your GravityWorks™ filter and wet the Hollow Fiber filter media, the fibers will still be wet. Therefore, it is important to prevent it from freezing, which can permanently damage the filter media. If you are traveling in areas where you are expecting freezing or near freezing temperatures, bring the filter into your tent, or even your sleeping bag. (Be sure to put the filter in a water tight bag to prevent leaks in your sleeping bag.) If you think your filter may have been damaged by freezing, perform a
Filter Test before the next use.