* A household using dual flush can save up to 20,000 liters of water per year compared to single-flush toilets. Though installation costs more, it is eco-friendly and lowers water bills. *IMPLEMENTATION* The dual flush was proposed by American designer Victor Papanek in 1976 and first implemented in Australia in 1980. *GET SMART* Use the smaller flush for urine and the larger flush for solid waste. Look for size differences or symbols like half circles or raindrops to identify them