They are better than the filters that come with the Germ Guardian air purifier. I've been using them for a year. I change them twice a year and the black pre-filter monthly. Highly recommended. I did NOT get them at a discount or for free and wasn't even asked to leave a review. I paid full price for these filters, read all the reviews and tried them. I only had the OEM filters that came with the Germ Guardian air purifier to compare. These are better.
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