About The Star brite No Damp Dehumidifier helps to control excessive humidity that can lead to musty odours, stains or corrosion aboard stored boats, caravans or seasonal homes. It uses specially designed crystals to remove moisture from the air and deposit it safely in the convenient container. These refill packs allow you to top up the dehumidifier once the existing crystals become exhausted. The refill crystals can be added on top of any remaining chemical.