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They are throw away. Once the are dirty they need to be replaced. How long they last is based on how much use. Several sources for replacement are available ... shop around for best prices,
Sorry, there was a problem. Please try again later.Hello Kevin, this is Kelly with Dyson. The filters for our air purifiers are not washable or reusable as that would damage the integrity of the filter and how it works to remove allergens and harmful particles from the air. We recommend replacing your air purifier filter every 12 months. This is because over time, filters can get clogged with pollutants, and even let unpleasant odors back into the room. Your purifying fan will alert you when it's time to change the filter. Best wishes, Kelly Dyson Customer Support
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