Breathe cleaner air with a filter that helps eliminate pet dander & odours. This combination filter has 3 levels of filtration formulated specifically to combat pet odours dander pet hair and dust. The all-in-one filter system combines a washable prefilter a HEPA filter and a 2-layer carbon pellet filter. In addition to common household allergens and pollutants this filter drum captures 99.97% of airborne pet dander. The filter drum is at the core of purifying your air. To keep your air purifier performing at its best it's recommended to replace the HEPA filter drum every 12 months (depending on usage). Compatible with all Leitz TruSens Z-3000 / Z-3500 Large air purifiers.