The WINIX HR 1000 HEPA and Carbon filter is suitable for both the HR1000 and the HR950 air cleaners from WINIX. The four fold filter consists of a pre-filter, a charcoal filter, a Hepa filter and an odor filter. The filter is provided with an antibacterial coating, which prevents a bad smell. The filter lasts 1 to 2 years, depending on the air pollution. Changing the filter is simple and is clearly described in the accompanying manual.