Review on 🌬️ InvisiClean Sensa Air Purifier – H13 True HEPA Smart Air Quality Sensor for Bedrooms, Allergies & Pets, Large Rooms, Smoke, Dust, Mold, Allergens, Odors, Carbon, Ultra Quiet, No Ozone IC-5120 Enhanced SEO by Brittney Merrill

This is a great cleaner. Drank for nine months. Very quiet at normal levels and easy to clean filter. THE ONLY PROBLEM: The instructions don't say how to reset (recalibrate) the sensor. We had the same issue that some others reported: a constant red light and turbo mode when set to 'Auto'. I found a solution in InvisiClean's answer to Revain's one-star review for this red light issue: (1) turn it on and set the fan speed to one; (2) press and hold the "Turbo" button until you hear a beep; (3) Seal the whole block in a large plastic bag and leave for 3 minutes. It worked great. You can also clean the sensor input with a cotton swab, but that didn't solve our problem; recalibrated.