How Long Have Plant Air Purifiers Been Functioning Without Filter Bed Replacement?

    Certain plant air purifiers have been functioning for more than 10 years without their filters having to be replaced, or without their owner having to clean them.  Microbes clean the filter bed automatically.  They digest the particulate matter trapped inside, giving welcome relief without undo labor or filter replacement.  Plus they use an assortment of other technologies to remove pollutants from the air.