Eztronics Corp&reg; High-Performance Filter HEPA Purple for Replacement Neato XV Series XV-21 XV Signature XV-15 XV11 XV12 XV14 (4) Replacement Filters for Neato XV-21 Pet & Allergy Automatic Vacuum Cleaner. Changing filter every 2 - 3 months recommended. Filters maintain optimal cleaning performance. Filters reduce infiltration of dust, pollen and other allergens. Prevents dust and dirt from escaping vacuum system.