Review on 🌬️ KOIOS Large Room Air Purifier - True HEPA Filter, Activated Carbon, UV Sanitizer, Ionic Air Cleaner - Detects Air Quality, Auto Mode - Removes Dust, Pet dander, Pollen, Allergens, Smoke, Odor - Ideal for Home & Office by John Ortiz

DO NOT buy Koios. I bought an earlier model Koios air purifier which started going haywire 3 months after purchase - the sensor started cycling through clean-dirty auto-tuning modes one by one like it couldn't do any Make decision. I contacted Koios about the guarantee, they replied a couple of times but then they stopped talking and started ignoring me. I've learned to live with it and just leave it in sleep mode at all times, although the effectiveness of this mode is questionable. A year later it's making horrible noises (mind you, they're claiming a three-year warranty) and I recently emailed them again. Ignore me completely! If I have a great recommendation, go with Levoit! Similar price, more interesting features (like Smart) and they keep their warranty! Although they also have their glitches, they had Revain send a new one within a week of me contacting them about my problem.