REPLACEMENT AIR FILTER: for Alen T500 Tower Air Purifier WHAT IT CAPTURES: Mold, bacteria, light odors, allergens, pollen, dust, dander & pet fur. True HEPA Filter to capture 99.99% of airborne particles down to 0.1 micron TRUE HEPA: Multipurpose filter built with a lightweight layer of activated carbon, True HEPA-Silver filter traps light chemical and smoke odors LONG FILTER LIFE: Recommended to change filter once every 6-9 months, or dependent on usage Our standard medical-grade H13 True HEPA air filter offers outstanding protection by removing 99.9% of dust, allergens, and harmful fine pollutants as small as 0.1 microns. Every 30 minutes, our product can purify your home or office air depending on the model of Alen air purifier.