Hong Kong has two parallel water supply systems, one for drinking water and one for flushing water. This is an excellent way to prevent precious drinking water being used as flushing water.
However, this system, as implemented in Hong Kong, has one major setback: since flushing water is supplied for free, there is no incentive for the user to minimise its use.
Automatic flushing systems in, for instance, offices and schools flush tens of thousands of litres of water 'down the drain' while the premises are abandoned, overnight, during weekends and public holidays.
This is a serious waste. It would be great if we, as citizens of Hong Kong, would take personal responsibility in this matter, although making people pay would probably improve the situation most effectively.
ROB VAN VEEN Mid-Levels