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Depends on the air quality. During the bad smoke from California fires the filter only lasted a week and a half. https://www.amazon.com/GermGuardian-FLT5000-Replacement-Germ-Guardian/dp/B003AKIGFS
Sorry, there was a problem. Please try again later.Depends on how bad your air is. I haven't had to replace it often. Usually, I'll replace it after the fire season is over and maybe once again in the year. If you've got bad air, you might need it every 6 months or so. If you don't have a lot, it's less often. It'll tell you.
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