Livatro Humidifier Cleaning Balls help keep your humidifier mist cleaner while reducing mineral buildup inside the tank, supporting a fresher and healthier home environment. Designed for long-lasting performance, each cleaning ball works for up to 30 days and is compatible with most warm and cool mist humidifiers, including ultrasonic, evaporative, impeller, and steam vaporizer models, as well as fish tanks. Simply place a ball into the water tank and let it float and work continuously—no scrubbing or complicated maintenance required. This 3-pack provides months of convenient use and easy replacement, making it a cost-effective solution for everyday humidifier care. Each ball measures 1.38 x 1.38 x 1.38 inches, so please ensure your humidifier opening can accommodate the size; for best results, replacement is recommended every 2–4 weeks.