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description: ultrasonic diffuser: breaks up water aroma solution into extremely fine micro-particles, diffuses into the air as mist without heat which destroys the therapeutic ingredients in the aroma solution. air purifiers: the negative ions generates also remove particles as small as 0.01 microns, such as pollutants, bacteria, fine dusts, smokes viruses which cannot be removed by filtered air purifier. negative loniser: negative ions increase the flow of oxygen to the brain cells, re...