Hoover replacement HEPA filter for the Hoover Air Purifiers WH10100 and the WH10200. Comes with a rinsable pre-filter that is the first line of defense in the multi-stage filtration system to catch lint, pet hair, and other large particles. and, a filter made with HEPA Media that traps 99.97% of dust and pollens down to 0.3 microns.