A real review on two of these so called covid filters.
Bought in April 2020 and thought the two I purchased were a great addition to help with covid. It is now November 2020 and one sounds like a model plane motor in the bath while the other stopped working in September. I jumped the gun on my original review and should have waited.  But I was asked by Amazon early on and now know I purchased junk. Folks, buy a good filter. There is no cutting corners on safety.
Rating: 1 stars