Water Wizz Toilet Saver
Try buying a installing a Water Wizz Toilet Saver. This super cheap water gadget will drop your toilet flush from 12L to 4L, depending on how long you hold the flush down. This groovy, easy to install device, simply fits into single-flush toilets in less than a few minutes.
This is a brilliant & practical water saving device that that could save you up to 20,000L per year - surely it's worth the effort. Furthermore, a duel flush system will set you back a minimum of $200.
RRP - $10.95
It's easy being green.
Andrew