Water treatment units are important in ensuring both the Legionella safety and the durability of the humidifiers. Untreated tap water is not usually suitable as it contains minerals and bacteria, which can damage the humidifier and are harmful to health. Legionella bacteria can cause serious health problems and even death should they be inhaled and reach the lungs.
It is imperative to take precautions to prevent this from happening. A reverse osmosis unit or a UV-C unit could be used. Removing the minerals from the water, which cause limescale, prevents the nozzles from clogging and extends the lifespan of the humidification system, also reducing the need for maintenance. The minerals present in the water would also be humidified causing a white dust, which is frequently corrosive.