Think of DampRid moisture absorbers as a dehumidifier that doesn't need electricity. They're the convenient, effective way to absorb excess moisture in the air that can cause stale, musty odors. DampRid's crystals absorb excess moisture in the air to create and maintain the optimal humidity level wherever moisture is a problem. DampRid Refill Bags are an economical, cost-effective way to maintain continuous moisture control. They offer long lasting moisture absorption and each refill works up to 45 days depending on temperature and humidity. When the DampRid container is full of water, just pour the liquid out and refill with more calcium chloride crystals. Not for use in moving vehicles. Keep out of reach of children. Do not allow product to contact leather or metal.