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How do I wash with water the back Hepa/carbon filter of my new air purifier? (Model #s: 300/RH02; E300/RH02)

We recommend not to use soap or any detergents, because soap leaves residue and chemicals within the soap/detergents may eat through the carbon materials. Warm water is sufficient with an old toothbrush to get any dirt out. When the filter is fully dry after washing, use compressed air to get out the rest of the dirt if any remains.

You do not have to wash the back filter once every 30 days, unless it gets really dirty every month. You can just use the compressed air once a month and then wash the filter once every 3 months or so, depending on how quickly the filter becomes dirty enough for washing. The carbon material will naturally lose some color with every wash, which is OK.