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The MeacoClean CA-HEPA 76x5 WiFi Air Purifier has one filter which is a combination of the following: the pre-filter, the HEPA filter and the carbon filter.. The whole filter must be replaced when the ioniser/filter button flashes red – it will do this after 2200 hours of use or if it detects a build up of dust and dirt on the filters.. For health and safety reasons this product cannot be returned if the plastic bag around the HEPA filter has been opened.