PuraClean® treated filters perform a better job of eliminating dust, dirt, dander, mold spores, and other airborne pollutants from your home's air, with a filtering efficiency improvement of up to 250% without causing air restriction. PuraClean does more than just function as an adhesive to keep trapped dirt bound to the filter. As the air passes through the PuraClean filter spray, an electrostatic charge (static electric charge) builds up on the filter drawing particles to the filter. Instructions: Simply spray both sides of any non-electrostatic filter and re-spray with every filter change. The air filter is essential as a first line of defense for indoor air quality. PuraClean® Filter Spray will transform any filter, whether it's a 99-cent disposable or a high-end pleated filter, into an ultra-efficient electrostatic version of itself. PuraClean is an ozone-safe cleaner that can be sprayed on quickly and easily without clogging your filter.