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No, but it's recommended because it emits mist that is clearer or you wipe up the white dust and clean more often.
Sorry, there was a problem. Please try again later.We recommend using distilled water for best results. As another alternative, purified or filtered water will be slightly better than tap water. However, if using tap water, please be mindful that the unit may need to be cleaned more often due to mineral buildup.
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