I have used these filters before and they work very well. You'll also save money as they come with four external activated carbon filters instead of just one like the original Germ Guardian filters. Use a handheld vacuum to clean the charcoal filter every one to two weeks, depending on how much or how little dust is in the air. Replace them after a month or two. The main filter should last 4-6 months, again depending on the conditions you are operating the unit in.
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