The DampRid 64 oz Hi-Capacity Moisture Absorber is the fast, easy, and effective way to control moisture in large spaces over extended periods of time. DampRid's natural crystals effectively control musty odors caused by excess moisture for up to 60 days in areas up to 1000 sq. ft. and up to 6 months in a 250 sq. ft. area, depending on temperature and conditions. It's incredibly easy to use. Just remove the lid to activate the crystals and place it on a flat surface. The Moisture Lock technology and sealed safety cover prevent spills and keep children and pets out. And when the crystals have completely dissolved, you can just toss it in the trash. The long-life of the DampRid Hi-Capacity Moisture Absorber makes it ideal for water damage restoration, seasonal use and storage of cabins, boats, RV's and campers. It's also great for: Basements, crawl spaces, garages, second homes or wherever you need lasting control of moisture and odors.