Smilyan Blueair Blue Pure 411 3-Pack Blue 3-in-1 HEPA Filter Replacement Compatible with 411, 411+, 411 Auto, MINI

• Amazon now offers Smilyan Blueair 411 3-pack HEPA filters for $24.98 (regularly $27.93).
• Prime members get free two-day shipping, and regular members get free shipping on orders over $35 within the contiguous U.S.
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Editor's Pick: After using an air purifier for six months, the filter turns gray and the airflow noticeably weakens. Swapping in a new set of filters makes it work like new again. This set includes both HEPA and activated carbon layers, which help during pollen season and when cooking with oil. Replacing the filters is simple—just open the cover and pull them out, no tools needed. The 3-pack offers great value and typically lasts about a year and a half.