1. You have to dust, vacuum, AND run the purifier in order to see a difference. They don't magic away the dust. I have a 300s running 24/7, 25% of the time on “sleep mode”, 60% on “low-medium”, 15% on “high”. My room is very small, I put it on top of my pc(I mainly use it to remove the dust so I don’t have to clean pc often…)the result is similar to your situation, I see dust on my desk, pc case and nearby things. There are some particles on the filter themselves. Does it work? Probably does but not what was I hoping for, to remove the visible dust. I guess they’re mean for the much smaller particles and bad stuff in the air. https://www.amazon.ca/Winix-5500-2-Purifier-Reducing-Washable/dp/B01D8DAYII/ref=sr_1_1?crid=29QGABWVGATHX&keywords=winix+5500-2&qid=1700333381&sprefix=winnix+5500-,aps,177&sr=8-1&ufe=app_do:amzn1.fos.71722c10-739d-471b-befb-3e4b9bf7d0d6&th=1 - 360 square feet