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A dual flush toilet uses 5 litres of water, compared to 13 litres from a regular toilet.

One litre of cold water used in a home is equivalent to 0.008 kg of CO2 emissions, and the average person will flush the toilet 5 times a day on average. Assuming we spend about ⅓ of our active time at home, this means we’ll flush approximately 1.17 times per day at home, or 2.8 times for the average Uk household of 2.4 people.

Using a dual flush toilet will save the average uk household 22.4 litres of water each day, adding up to 8,176 litres per year.

Switching to a dual flush toilet saves up to 65 kg/CO2 per year per household.

Sources: Waterwise 1, Waterwise 2, CS Monitor, Our World in Data