Fanless and filterless, it tends to make no sounds and desires no repairs, but you might want to make sure to clean from the ionized dust that builds up in the vicinity of it within the wall. Tyent generate ionizer machines that will deliver alkaline water on tap but here https://allhealthmarket.com/product/home-care-2/oxygen-and-hydrogen-generator/hydrogen-water-generator-450ml-hydrogen-and-oxygen-inhalation-machine-molecular-h2-inhaler-water-ionizer-home-care/