The Protec Humidifier Cleaning Ball beads are coated with the same preservative that has been used for years in the food and drinking water industry to prevent objectionable odours, tastes and colours. The Protec Humidifier Cleaning Ball:

• Offers continuous protection against buildup of mineral deposits in your humidifier
• Works in most humidifiers – just drop into the tank for fresh, cleaner mist!
• Contains no harmful chemicals
• Keeps cleaning for 30 days