We use Honeywell 2 stage air purifiers, a large one in the living room & a smaller one in our bedroom. They use a prefilter that catches odors, most dust and pet hair, and separate HEPA filters for small particulates. This is in addition to a whole house HEPA system on our HVAC. We have a smaller one in our tiny house in Texas, and will be purchasing one for our camper yet this fall.
I read all the reviews before I bought, concluded that most of the good filters were very closely matched in their ability to trap pollution, and chose the Honeywell for 2 very pragmatic reasons - they have been around forever and use standardized filter - so are readily available in a multipack. And they have signal lights that tell me when to change them. Even though the prefilters are supposed to be good for 3 months, I usually need to change them more often.
My kids each bought top-rated HEPA filters from new manufacturers a few years ago, and both companies are gone. When they use up their current supply of filters, they will need to buy new machines. And one has a pre-filter that requires weekly vacuuming - no way I want to be exposing myself to that.
The 99.97% HEPA filters, not matter the brand, should capture NTM and just about every other bacteria, not pass it through.
When it is time to change the filters, I mask up, take a bag to the machine, drop in the old filters and tie it shut. That minimizes exposure, and any chance of shaking contaminants loose around the house.
which model Honeywell is that Sue? Do you leave it running all the time?? I have a Honeywell but rarely use it for some stupid reason! It is kind of large and takes up room if that is an excuse.