Running times may differ from unit to unit. On average, most units are designed to operate for 8 to 18 hours with one filling.
The indicator will be near the "empty" mark when the water level in the tank is at or below the half-full point.
Cleaning times for humidifiers vary: When used continuously, clean after 48 to 72 hours of operation. When used occasionally, drain, rinse and dry thoroughly after every use. Clean periodically to remove mineral deposits. Always clean before and after long periods of storage.
Soft abrasives are recommended for cleaning the brown residue out of the humidifier.
The humidifiers with the Glow in the Dark reservoirs will glow for 1 to 2 hours.