Many people still think that these 2 buttons is just for flushing

Water Savings By switching from a single flush to a dual flush toilet, a household can save as much as 20,000 liters of water per year. Although the initial installation cost may be higher than that of a standard toilet, the environmental benefits and reduced water bills make it a worthwhile investment.

Historical Context The concept was popularized by American industrial designer Victor Papanek in his 1976 book Design for the Real World. The dual flush mechanism was first implemented in Australia in 1980.

In summary, dual flush toilets are designed not just for functionality but also for significant water conservation, benefiting both the environment and household budgets.