I took a chance buying an air purifier with only 9 reviews but I have no regrets! When I turned it on the indicator initially turned red, it took about 30 minutes before it finally turned green (I had that on a car). It's quite loud at maximum, but that doesn't bother me. At the 1st level it is very quiet, it is almost inaudible. I like that it's small and easy to move to different rooms in my house. I don't know about replacement filters, I don't see where to buy them.
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