Compatibility: Compatible with Idylis FIL-GG-125 filters. Engineered to fit Idylis Air Purifier Model IAP-GG-125. Air Quality Improvement: Filtration is rated H13 and removes up to 99.97% of airborne particles as small as 0.3 microns in size including dust, smoke, pollen, pet hair and dander, mold spores and dust mites. Filtration Levels: Attached charcoal pre-filter reduces household odors and captures larger particles before reaching filter, extending life of filter. Compatible with Idylis FIL-GG-125 filters. Engineered to fit Idylis Air Purifier Model IAP-GG-125. Attached charcoal pre-filter reduces household odors and captures larger particles before reaching filter, extending life of filter. Recommended to change this filter once every six (6) months under normal conditions, and more often under harsh air conditions. Each package contains two (2) replacement filters with attached pre-filters.