Our fastest acting moisture absorber. 2 drop-in tabs. This product works most efficiently in closet areas. The effectiveness of the product will be comprised in well-ventilated spaces Refill every 30 to 60 days (Duration will vary based on temperature and humidity). When you have musty odors from excess moisture, you need a fast solution. DampRid Reusable Drop-In Moisture Absorber is our fastest acting moisture absorber. The Drop-In Tab goes to work immediately by attracting excess moisture from every angle. And refills are easy and mess-free thanks to the pre-measured design.