Humidifiers; water softeners, namely, water softening apparatus; dechlorinators, namely, water treatment apparatus for removing chlorine; reverse osmosis water treatment systems, namely, reverse osmosis water treatment units; water softeners, namely, water softening apparatus, sold as a component of a humidifier; de-chlorinators, namely, water treatment apparatus for removing chlorine, sold as a component of a humidifier; reverse osmosis water treatment systems, namely, reverse osmosis water treatment units, sold as a component of a humidifier