Since 28th March 2003, the Aquatic Centre of the Olympic Sports Centre, occupying an area of 10,172 sq.m., has acted as the major training base for swimming sports in Macao. In addition to a skilfully designed roof utilising natural light, the Centre features many environmentally friendly facets such as using an ozone water management system to reduce discharge and pollution from wastewater and utilising excess heat from the boiler for air-conditioning.