Concrobium Moisture Grabbers Hanging Bags eliminate excess moisture for cleaner, fresher air. Excess moisture can cause unpleasant odours, mould and mildew stains and can damage items. Moisture Grabbers absorb and trap excess moisture to create optimal humidity levels, without causing excessive dryness. Anti-Leak technology captures the absorbed moisture in a gel to protect from leaks and punctures. Directions for Use: Remove the hanging moisture absorber from the clear wrapper. Hang the bag in the desired location, allowing enough space for air to circulate around the bag. When the crystals in the top portion have dissolved, dispose of them in the general rubbish and replace with a new bag. Each bag will last for approximately 60 days, depending on conditions. The duration will vary depending on temperature and humidity.