Fanless and filterless, it helps make no noise and desires no maintenance, but you have to remember to clean off the ionized dust that builds up in close proximity to it about the wall. I also recognize the self-cleaning element of the ionizer. It routinely reverses polarity soon after Every https://allhealthmarket.com/product/home-care-2/oxygen-and-hydrogen-generator/oxygen-concentrator-450ml-hydrogen-water-generator-hydrogen-inhalation-machine-ionizer-99-99-h2-molecular-inhaler/