The hydrophilic crystals helps to retain moisture from air and helps combat condensation, damp rooms, allergens in the air, mould, mildewEasy Hanging Wardrobe Dehumidifier designed to remove dampness & humidity from the air in your wardrobes & homeThe first drop appears within 4-7 days depending on the humidity level. Absorbs up to 3 times it's own weight in waterEasy to Hang. Ideal for Wardrobes, caravans, boats, garages anywhere excess moisture is causing a problemDepending on the humidity level, the product will last between 4 - 6 weeks