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The NaturalAire Electrostatic is a fast, easy and economical upgrade from ordinary disposable filters. Wash this unique filter out just once a month, let it dry and re-install. You can use it over and over again for up to 5 years. UL Class II Washable and Re-useable Electrostatic charge improves dust-holding efficiency Effective against mold spores, pollen, nuisance dust, and dust mite debris.