The filter is a great way to extend the life of my HEPA filter. Just after July 4th, I checked my air purifier's activated carbon pre-filter. Particulate matter from all the fireworks near my house has coated the old charcoal pre-filter. It was great to be able to quickly swap out just this item to extend the life of my HEPA filter. It's still important to change the true HEPA filter regularly, but I feel like changing the carbon pre-filter really helps it last a short time.
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