A aroma diffuser no water may be right for you if you are trying to prevent, reduce or eliminate colds, sinusitis, the flu, as well as stress, anxiety, emotional imbalance and more. The Ultrasonic water diffuser can do the job too, but since no water oil diffusers use pure, undiluted essential oil, nebulizing aromatherapy diffusers are usually considered the best choice for the more acute conditions. Quality personalized waterless oil aroma diffuser will always give you a refreshing experience.