My sister recommended Sans to me because I’m an asthma patient. Her husband is a full time oxygen user and she is very pleased with hers. I ordered it and noticed less dust accumulation right away. I have glass top tables and it’s so easy to see the difference! So I can highly recommend this air filter!

We've only had the large one for a couple of weeks, but it appears to be helpful on the dust accumulation. I would clean before & in a day or two the dust was back. Now it's a few days which is tolerable. Also, noticed some impact on allergies, but still too new of a trial. Likely will keep the Sans for the dusting factor alone. The unit is very quiet on Auto. If manually set on the second or third level, they you can hear it but it's kind of like white noise (that you start to tune out). We turn off the lights as we don't need to see them.