Air O Swiss Refill Grandules #1218

* NEW and patented refill process! * When properly installed and maintained the granules effectively help to prevent the release of minerals in the air. * Granules should be replaced every 2 – 3 months; hard water usage may require more frequent replacement. * One box includes 3 single refill packets - use just one packet per refill. * For use with the AIR-O-SWISS demineralization cartridge AOS 7531.

AIR-O-SWISS offers two options for replacing the demineralization cartridge: Replace the whole cartridge with a new part (model AOS 7531) or use replacement granules (model AOS 7533 Refill Granules 3-Pack) to extend the life of the cartridge.