PUB, the national water agency, and the National Environment Agency (NEA) thank Ms Sng Hwee Lee for her letter ("Auto-flush system wastes water"; Tuesday).
Since 1998, all new public toilets have been required by the NEA to be fitted with sensor-operated flush valves to improve hygiene, as these are operated without hand contact and will ensure toilets are flushed automatically after each use.
To ensure water efficiency, PUB has mandated the flush volume for sensor water closet flush valves at not more than 4.5 litres, similar to that for manual water closet flush valves and flushing cisterns.
All sensor flush valves must meet the requirements specified by the PUB. Flushing shall be activated only after the user moves out of the sensing distance. Building managements are required to carry out regular maintenance to ensure that the sensor flush valves continue to perform properly, so that unwanted and multiple flushing does not occur.
The public can report any faulty flush valves or water fittings to the building management or PUB's 24-hour call centre on 1800-284-6600.
Chong Hou Chun
Director, Water Supply Network Department
PUB, the national water agency
Tai Ji Choong
Director, Environmental Health Department
National Environment Agency
This article was published on April 5 in The Straits Times.
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