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5. With the front grill removed, check the condition of your HEPA filter. If the filter is dirty, remove the used HEPA cartridge and properly dispose of it. DO NOT try to wash and re-use the HEPA filter. Replace with a new HEPA filter, removing the protective polybag before inserting into the air purifier. NOTE: The side with the soft gasket should face inward. 6. The filter reminder dial should be set ahead 3-6 months depending on usage. 7. Filter Life – Under normal conditions of continuous us