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Generalaire Humidex Scale Reducing Tablets - Sleeve of 12 Tablets. HUMIDEX TABLETS precipitate scale and silt as a soft, easily rinsable slurry that is flushed out of the humidifier with almost no effort. Float valves, pumps, evaporator pads, plates and electrodes are kept free of hard water encrustations which either make the humidifier inoperative or inefficient. HUMIDEX TABLETS are used to remove hard water mineral scale, encrusted silt and corrosion from central and portable humidifiers. HUMIDEX TABLETS can be used in wick, power and portable humidifiers. Characteristics: • Prevent and eliminate hard water scale, encrusted silt and corrosion • For use in central and portable humidifiers • Keeps humidifiers and vaporizers clean and efficient. • Covered by U.S. Patent N0. 3,110,684. • Easy to use tablets.