The zeolite is reusable indefinitely, though it seems probable that it could drop its success over time due to obtaining “clogged up”. Presumably that’s what the filters are for: to maintain dust, pollen, and also other big stuff that might clog the zeolite pores out from the zeolite tanks. We https://icelisting.com/story14153106/not-known-factual-statements-about-humidified-oxygen-concentrator