Modern toilets today come with two flush options—one smaller and one larger. They’re known as dual flush toilets. But have you ever wondered why there are two choices? Let’s explain.

The idea of dual flush
Dual flush toilets are designed with two buttons or levers. One is small, the other large—and each is connected to its own outlet valve.

Purpose: water conservation
The larger button releases about 6 to 9 liters of water, while the smaller one uses just 3 to 4.5 liters. The big flush is meant for solid waste, and the small flush for liquid waste.

How much water is saved?
Studies show that households using dual flush systems can save up to 20,000 liters of water every year compared to single flush models. While installation may cost a bit more, it’s eco-friendly and helps reduce your bills.

Where it started
The concept was introduced by American designer Victor Papanek in his 1976 book Design for the Real World. Australia was the first country to put it into practice in 1980.

Be smart
So next time you use the toilet, flush according to your need. For urination, use the smaller lever—often marked with a small circle, half-circle, or raindrop. For solid waste, press the larger button, which is usually bigger or has a clear indicator.