The DampFree Moisture Absorber Tub creates an easy, hands-off approach to a damp free environment. The crystal formula works by gradually pulling moisture from the air and protecting against dampness, rust and musty odours that can damage your tools, clothing and other possessions. To use, simply remove the lid and peel off the foil moisture barrier leaving the paper safety cover underneath intact. Place the Tub in your desired location and allow the moisture-hungry-magnets to activate and get to work. When the unit is full of water, discard the Tub and replace. This Tub is best suited to enclosed spaces up to 55m² in size and can absorb up to 4.4Lt of water over 12 months depending on temperature and conditions. Overly humid environments also present opportunities for mould and mildew growth, leading to allergens that trigger Asthma and other respiratory problems. Do not use near metal and leather goods.