Water-cooled chillers use water to transport away the heat rejected in their condenser. The water, called condenser water is cooled in a cooling tower. Water-cooled chillers are located indoors, which means that noise and vibration created by the chiller and its associated pumps may become a problem throughout the building. It has a separate flow of water passing through their condenser, typically at around 20-30°C. This is then passed through a cooling tower. In an open circuit-cooling tower, the condenser water is directly cooled by spraying it onto large sheets called media and passing air through the media.