DampRid FG50FS hi-capacity moisture absorber, 4-pound tub. Eliminate musty odors in large spaces. Worried about flood damage in a basement or maintaining optimal humidity levels in a vacation home, boat, or rvbrandnameinternal fg50t hi-capacity moisture absorber removes excess moisture from the air, eliminates musty odors, and protects from moisture damage. DampRid natural crystals effectively control musty odors caused by excess moisture for up to 60 days in areas up to 1000-square feet, and up to 6 months in a T-square foot area, depending on temperature and conditions.