Compatible Models: Dyson Pure Series air purifier fan DP04, TP04 compatible products (non-genuine) Material: 360° ultra-fine glass fiber HEPA filter and upgraded activated carbon Dust Collection Function: The 10-meter PEFE HEPA filter, folded 260 times, removes 99.95% of PM0.1 harmful fine particles. Although the difference in filter rate of 0.95% is small, the effect is clear. The harmful particulate matter released from a 99% filter is 20 times that of a 99.95% filter. Deodorizing Function: Adds a Tris upgraded activated carbon net, improving the ability of activated carbon to absorb and decompose formaldehyde. Three times more activated carbon than the previous generation of air purifiers, removing more harmful substances. Crystals can absorb harmful gases, odors, and indoor smoke. Replacement Timing: As it is a consumable, it is recommended to replace it every 6-12 months. Especially in households with pets, it is recommended to shorten the replacement time. Quantity: 2 sets