There seems to be more and more private swimming pools nowadays, with practically every condominium, executive condo and even private home here having one.

Such a scarce resource should not be used so extensively in such a manner here, especially with water levels falling amid the current dry spell ("Water levels low at Singapore's main source"; March 23).

Private owners of swimming pools should be made to pay a much heavier levy for the water they use to fill their pools.

There could even be a bidding system - similar to the certificate of entitlement (COE) system - where home owners must bid for a COE to build a private pool.

Perhaps the number of public swimming pools here should also be reduced to save water.

Tan Tor Seng