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The volume of water in the tank, its height above the bowl, restrictions or blockages between the tank and the bowl, or within the bowl all limit the speed and amount of work the tank water can perform. If your toilet is less than ten years old, you may have a first generation 1.6 gallon low flush toilet. These toilets were mandated by the 1992 Energy Policy Act in an effort to save water. Traditional toilets used 3.5 gallons of water per flush.
Potty Smarts: Know Your Toilet. 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.rugal Flushing. Toilet flushing is the single highest use of water in the average home, so it also presents a prime opportunity for water conservation. With the average person flushing five times a day, toilets make up about 31% of overall household water consumption.