Compatible Air Purifier Models :Pulluty Core 300 HEPA Replacement Filter Widely compatible with LEVOIT Core 300 / Core 300-P / Core 300S Air Purifier.Compared to Part # Core 300-RF.NOTE:This is not a OEM product but compatible with LEVOIT replacement filter. Any use of the brand name or model designation for this product is made solely for purposes of demonstrating compatibility. 3-in-1 High Efficiency Filtration :Our Core 300 True HEPA Air Purifier Filter Replacement features 3-Stage Filtration System: Fine Nylon Preliminary Filter h13 HEPA Grade Filter Activated Carbon Filter. H13 True HEPA Filter :The high efficiency Core 300 HEPA air filters capture 99.99% of airborne particles and particles as small as 0.01 microns. The activated carbon prefilter absorbs smoke, cooking fumes and noxious odors from harmful volatile organic compounds. ActivatedD Carbon Pre-filter :The activated carbon pre-filter of filter collects dust,pet hair,and other large particles, while extending the life of the HEPA filter.Treated carbon take in volatile organic compounds from the air and reduces odors from smoking, cooking and pets. VALUE PACKAGS :Package includes 4 x H13 True HEPA Filter. For the best performance, it is recommended to replace the HEPA filter every 6-8 monthsfor the best performance (depending on your usage and environment), and obtain higher filtration performance for long-term use.