Airdog X3 Bed Purifier vs. HEPA: Tested Clean Air, Washable Filter, Surprising Power We were skeptical at first—claiming "up to 20X more effective than HEPA" sounds almost too good to be true. But the Airdog X3 delivered. Ours is in the bedroom, and the difference is immediately noticeable: the air feels purer, the dust buildup on surfaces is lower, and even pet hair seems to settle more effectively. The washable filter, though small, is a game-changer—not needing constant replacements saves both money and hassle. Running on a quiet, whisper-quiet setting, it blends seamlessly into our nighttime routine. We测试ed its odor-removing capabilities after cooking, and the results were impressive. It tackles allergies, smoke, and general household pollutants with surprising finesse. While we continue to test its long-term performance, the initial experience is promising.