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Contains 4 carbon filters replacements for use with GermGuardian FLT4200 HEPA filter for FLT4200W Air Purifier Activated charcoal absorbs household odors from pets, cooking, smoking and more. The replacement Activated Charcoal layer captures large dust particles and pet hair, extending life of the HEPA filter. For proper performance the carbon filter needs to be cleaned and or replaced as needed. IMPORTANT: Use genuine Guardian Technologies replacement parts to maintain product performance.