The dual flush toilets invented by American industrialist Victor Papanek and commercialized in 1980 by the Australian sanitary products company Caroma.
These toilets have two flush buttons a small and large button. The large button to flush out solid waste uses 6-9 liters ( normal toilets use 11 liters/flush) of water and small button to flush out liquid waste uses 3-4.5 liters of water. The placement of small and large buttons is with notion of water conservation. Dual flush toilets can save 20,000 liters of water per year. Various types of large and small flush buttons have evolved in present times, which are easily noticeable.
Next time you come across a dual flush toilet in airport, mall, community halls, hotels, schools or in colleges keep in mind to use the respective flush buttons to save water. If affordable, consider installing a dual flush toilet at your home. With proper installation and maintenance dual flush toilets can save water and on water bills.
References
1. www.thespruce.com/dual-flush-toilet-5547719
2. www.news18.com/news/lifestyle/what-are-dual-flush-toilets-know-its-inventor
3.timesofindia.indiatimes.com/life-style/health-fitness/photo-stories/heres-why-toilet-flush-has-one-large-and-one-small-button
