Enlifery PC-2 Piece Humidifier Tank Cleaning Capsules - Hard water Treatment Demineralization Capsules (2 Pack) Each capsule will last up to 60 days! Purifies your water Non-Staining, 100% toxin Free Keep humidifiers running longer and cleaner, Help to resolve hard water mineral mold and bacteria build-up Work with all type of humidifiers, (Warm & Cool Mist, Ultrasonic and Vaporizers) Compatible with water tank opening up to 1.12 inch in diameter.