The Kampa Damp Buster 2.5kg Refill.
These are refill moisture crystals suitable for use with Moisture Buster or Damp Buster Moisture Drain. Place crystals in the basket of the Moisture/Damp Buster and moisture from the surrounding air will be collected and stored in the reservoir. Check the levels periodically, remove and discard the crystals when the reservoir is full and the crystals have all turned to gel. Refill basket with more Damp Buster crystals.