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This filter creates a static electric effect as air passes through it attracting particulate to .025 of an inch. Simply wash with mild detergent and allow to dry. Reinstall back into the filter rack on the Eliminator. These filters will save you hundreds even thousands of Dollars over purchasing disposable filters. Purchase an extra set for your Eliminator so that you can change out dirty ones and clean when it is convenient. Failure to clean filters at regular intervals can potentially damage fan motors and void warranty on electrical components.