Apparently, all you have to do is replace the filter, which should be done anyways. EDIT: and apparently I was wrong. "Overall, endotoxins deposition in the a

Apparently, all you have to do is replace the filter, which should be done anyways. EDIT: and apparently I was wrong. "Overall, endotoxins deposition in the alveolar region increased regardless of whether the air purifier was loaded with used or new HEPA filters."