Brand new and unopened Homedics Total Comfort Demineralization Cartridges—each box contains 4 cartridges designed to reduce mineral buildup in ultrasonic humidifiers. These work with Homedics humidifiers with a 0.5-gallon tank or larger to extend the life of your humidifier and improve air quality. I no longer use this humidifier brand, so these are up for grabs! 📦 Condition: Brand new in factory-sealed packaging ✔ Compatible with all Homedics ultrasonic humidifiers (0.5-gallon tank or larger) 💧 Prevents white dust caused by hard water 🔄 Extends the life of your humidifier See photos for full details, and feel free to ask any questions! ⭐ Bundle 3+ items and get 15% OFF! I’m a Poshmark Top-Rated Seller and ship fast! ⭐ ✨🛍️New to Poshmark? Get $10 Off! https://posh.mk/h53OY7A1zQb Sign up with my referral code NATASHAOCTON and get $10 off your first purchase! Just enter the code at sign-up. Happy shopping! 🛍️✨