There are new designs arriving on the market all the time. Two new innovations hold a lot of promise. One is the Flapperless toilet which as the name says, does not require a flapper valve. This is news because worn out flapper valves are the number one source of toilet leaks. Dual flush toilets feature a 3L flush for liquid waste and a 6L flush for solid waste. They save about 25% more water than a conventional 6L. There are also a number of good performing 4L pressure assist fixtures that perform well.
