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Can You Use Tap Water in a Humidifier? Water Quality Guide

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Overview

A humidifier’s water quality directly affects mist output and health. Tap water contains minerals like calcium and magnesium; ultrasonic humidifiers turn them into white dust that can irritate airways. So ultrasonic models should use purified or distilled water, while evaporative models are more forgiving but still need regular cleaning.

Humidifier TypeRecommended WaterReason
UltrasonicPurified or distilled waterReduces white dust and mineral irritation
EvaporativeTap water OK, purified betterMore forgiving of water quality
Warm-mist (heating)Purified or distilled waterHeating causes scale

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