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Do you know there would be possible secondary pollution caused by HEPA filters that are not replaced in time? Normal HEPA filters collect all particles on the filter surface and need to be replaced regularly, or you will encounter a risk of possible secondary pollution. The collected particles will also promote mold growth. Do you know a HEPA filter is equal to at least 1000 plastic bags? HEPA filters are made of non-degradable plastic, which has caused a great burden on our earth. Airdog takes both air purification and environmental protection into consideration. It is true because of this concept that we have launched the world's first filtration technology called TPA. TPA Technology: Active Filtration. By adopting a subversive high-pressure ion air filter, the X5 air purifier terminates all harmful particles rather than just collecting them. Lifetime Reusable Filter: In addition to the outstanding purification efficiency, the TPA filter is washable and reusable for life, and it is made from Graphene material, which is more durable and recyclable. Real-time AQI Reading: With the built-in air quality sensor, the Airdog air purifier for a large room can read the real-time AQI (Air Quality Index) and reflect it in the form of an indicator light. The Airdog X5 air purifier for the bedroom is designed with a wide 360° air circulation range, completely purifying a 900 ft² (84m²) room twice per hour and a 300 ft² (28m²) room six times per hour. The Airdog air purifier for bedroom is certified by the official third-party, which captures and terminates 99.9% of airborne contaminants (down to 0.0146 microns in size), clearing your environment of dust, pollen, pet dander, mold spores, odor, TVOC, formaldehyde, Removes Viruses, Mold, Bacteria, Allergens, Asthma Triggers, Smoke, Odor Pets, Dust.medical air purifier with FDA.large medical air purifier for room large medical air purifier for large room large medical air purifier for bacteria large medical air purifier for viruse