(Replace One Pre-Filter Every 6-12 months)
The pre-filter in these HEPA air purifiers protects the HEPA filter by catching the larger dust particles and allergens before they can get to the HEPA filter. This allows the HEPA filter to last up to five years while catching the smaller more reactive dust particles and allergens down to 0.3 microns of size. The pre-filter can be vacuumed off from the outside case of this Airpura UV600 HEPA air purifiers for easy maintenance. The pre-filter should be replaced once a year with normal use.