ELIMINATES WHITE DUST: Reduces the release of white dust caused by dissolved minerals in hard tap water SCREW CAP DESIGN: Screws into the water tank and replaces the existing water tank cap QUICK INSTALLATION: Easy to install and remove from the water tank LONG LASTING: For optimal performance, change your decalcification cartridge filter every 2-3 months COMPATIBILITY: Designed to fit Pure Enrichment’s MistAire Cloud and Hume Max Top Fill humidifier (sold separately)