When the JF180 Air Purifiers Filter Light Turns Red, indicating the need for replacement. This is typically after 3-6 months of use. REMOVE PLASTIC PACKAGING BEFORE USE Before using the new filter, it is important to remove the plastic packaging. This will help to prevent the filter from becoming clogged and reduce its effectiveness. MULTI-STAGE FILTRATION SYSTEM The JF180 air purifier uses a multi-stage filtration system to remove pollutants from the air. This system includes a pre-filter, True HEPA filter, and activated carbon filter. The pre-filter removes large particles, such as dust and pet hair. The True HEPA filter removes 99.97% of airborne particles as small as 0.3 microns, and even smaller particles down to 0.015 microns, including pollen, mold spores, and viruses. The activated carbon filter removes gases and odors. CLEAN PRE-FILTER MONTHLY To maintain the efficiency of the JF180 air purifier, it is important to clean the pre-filter monthly. This can be done by vacuuming the filter with a vacuum cleaner. SPECIFICALLY DESIGNED REPLACEMENT FILTER FOR JF180 AIR PURIFIER The JF180 air purifier replacement filter is specifically designed for the JF180 air purifier. It will not fit other models of air purifiers.