I'm just a layman who enjoys trying to do the job myself. studied for a long time. When choosing AOTA rubbers, the price of the filters is an important consideration. It has 2 washable filters, actually three if you don't mind taking the time to wash the carbon filter. All filters are cheap to replace. MUCH cheaper than other scrubbers. Worked great. Removed plaster dust and rotting wood dust from my 100 year old basement.
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