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The salt crystal lamps have a similar effect to the ionizer. They improve the general atmosphere of a room.
The salt crystal lamp binds the negative ions with the excess positive ions. When the lamp becomes warm, it absorbs moisture and the crystal will be damp on the surface. This builds up the ion field. Through the lamp, the positively charged atmosphere of a room can be neutralized. Because the salt absorbs moisture from the atmosphere, it is advisable to use the lamp or a minimum of 30 mins daily.