Question: how much water does the average toilet use per flush?
Answer: In the 1830s the average person in the UK would have got by on just 18 litres of water per day, however nowadays we are using over 135 litres a day (7.5 times the volume). Toilet flushing accounts for 1/3 of water used in the home today; one toilet flush using an older style toilet uses 14 litres of water.