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IQ Healthpro. Three filters. The first one you change roughly every 6-12 months. Depending on the environment. The second carbon one about every 12 or so. The HEPA third one you change around 18 months or so. It has a light telling you based on your usage when to change each one.
I LOVE my IQ. It's built tight so there is NO ozone or escape of particles.
Compare this to a Holmes that required new carbon monthly and even new HEPA after about 3 - 6 months. And didnt do anywhere near the same job. No comparison. Then again there's no comparison in price either....
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