BISSELL 2801 MYair Personal Air Purifier Replacement Filter, 1 Count (Pack of 1) Replace Filters Every 3 Months. Keep your air purifier running its best by changing your filter regularly. Genuine Replacement Filter. Works in BISSELL MYair personal air purifiers. Capture Odors & VOCs. Eliminate pollen, dust, pet dander, odors, and volatile organic compounds.