PD Mist Design Humidifier Ceramic Water Filter Replacement water softening filter for the Puredry Mist Humidifier. The water filter protects the humidifier and the space from the effects of hard water. The water filter should be changed whenever you see white powder in the mist of the humidifier, the rate of changes varies depending on whether you have hard or soft water.
PD MIST WF
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