Wide applicability: This humidifier cleaning box is with for ProTec Kaz PC-1 and PC-2, and is suitable for evaporators, generators, ultrasonic humidifiers, steamers, gentle spray humidifiers and fish tanks. working performance: These humidifier cleaning balls can keep the spray of the humidifier clean and work normally. Keep the humidifier water tank and fish tank clean. Extend the service life of the humidifier and save cleaning time. Keep it clean for 30 to 60 days. Easy to : Just put the humidifier cleaning box into the water tank and working. A cleaning ball can be used for the humidifier, and the water tank capacity does not exceed 1 gallon. For humidifiers with a capacity of 1 to 2 gallons, it is recommended to two cleaning balls. We recommend replacing it 30 to 60 days. Reminder: The size of our humidifier cleaning ball is 2.36x1.18 inches/6x3cm. The filling can be used up to 40 . The diameter of the humidifier opening should be at least 1.18 inches (approximately 3.0 cm). Please check your humidifier opening to make it is enough to accommodate these humidifier cleaning boxes. Performance: The ingredient of the humidifier is mainly silver . Humidifier fish can extend humidifier wicking filter life and keep the water clean, prevent objectionable odors and reduce the number of cleanings. colour: blue Material: plastic Package Contents: 10 x Humidifier water tank ball Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.