Hepa Filter - HEPA filter for 360 degree filter system, Double-layer HEPA filter helps remove pollutants and purify the air.Replacement Hepa Filter and Replacement Activated Carbon Filter for Dyson HP04 TP04 DP04, System air purifier sealed two-stage filter, fan for Pure Cool purifier. Package includes: - 1 x Hepa filters, 1 x activated carbon filters;Let the air more pure and fresh, beneficial health, Activated Carbon Filter Replacement Hepa Filter and Air Purifier Activated Carbon Filter for Dyson TP04 TP05 HP04 HP05 DP04. Replacement Replacement of HEPA filters and activated carbon filters Time Use - HEPA Filter: We recommend replacing it every 12 months when you use it 12 hours;Activated carbon filter: we recommend replacing it every 6 months when using it for 12 hours. Activated Carbon Filter - Filters can contribute to your health by providing you with a clean and fresh environment, helping you save on your energy bills. Hepa Filter - HEPA filter for 360 degree filter system, Double-layer HEPA filter helps remove pollutants and purify the air.Replacement Hepa Filter and Replacement Activated Carbon Filter for Dyson HP04 TP04 DP04, System air purifier sealed two-stage filter, fan for Pure Cool purifier.