The True HEPA Replacement Filter for the Truclean Air Purifier capture at least 99.97% of airborne particles 0.3 microns in size, so you can enjoy fresh air even longer. Featuring greater adsorption and a honeycomb structure, the improved filters cover a larger surface area. To do its best work, Levoit recommends replacing the filter every 6-8 months - the filter may need to be replaced sooner or later depending on the air quality in your area.
Replacement Filters for LEVOIT LV-PUR131 Air Filter Purifier HEPA Filter and Activated Carbon Pre-Filter (2 Pack)
Climestar Filter for Levoit Air Purifier LV-PUR131, Part LV-PUR131-RF
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Levoit Air Purifier LV-PUR131-RF Replacement Filter True-Hepa & Activated Carbon