Take a look at this video by DampRid demoing their refillable moisture absorber products. DampRid's calcium chloride crystals last up to 45 days in a 150ft square space, eliminating excess moisture in the air to prevent mold, mildew and musty odors. To learn more about DampRid's Moisture Absorber products visit us at http://tinyurl.com/6a2m9f6