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What Water Should You Use in a Humidifier?

Overview

Best is purified or distilled water, then boiled-and-cooled water; avoid tap water. Water quality directly decides mist quality, white dust, and unit lifespan.

WaterWhite DustBacteria RiskEffect on Unit
Purified/distilledNoneVery lowBest for the unit
Boiled-and-cooledLittleLowFairly good
Tap waterHeavyHigherScales easily