Cartridge, Your humidifier stays cleaner, longer, Simply drop in tank for fresh, clean mist, Works in all humidifiers, Keeps cleaning for 30 days, Safe and non-toxic, Continuous protection against slimy build-up in humidifier, Concentrated antimicrobial cartridge, Carded, Length: 3, Width: 7, Height: 2 SKU: JNSN16239