In a home with older toilets, an average flush uses about 3.6 gallons (13.6 liters), and the daily use is 18.8 gallons (71.2 liters) per person per day. In a home with ultra-low-flow (ULF) toilets, with an average flush volume of
1.6 gallons (
6 liters), the daily use is 9.1 gallons (34.4 liters) per person per day.
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