Nu Calgon Humidi-PRO Humidifier Treatment, white, single unit (4190-02)

The genuine Nu-Calgon 4190-02 is a single In-line Cartridge of Humidi-Pro and is considered a scale inhibitor for 25 Gallon/Day humidifiers. | Humidi-Pro is not to be used on hot water lines and has usage temperatures of 40F to 80F. | The Nu-Calgon 4190-02 can be installed vertically or horizontally and includes two 1/4 inch compression fittings. | Nu-Calgon Humidi-Pro will inhibit scale for one season. | Nu-Calgon, the brand you trust, provides quality chemicals and specialty products for professional use only in the air conditioning, refrigeration and heating markets.