Question: how much water does a toilet use per flush in litres?
Answer: For example a full flush toilet uses about 11 litres per flush compared to a dual flush toilet which can reduce each full flush to 4.5 litres and each half flush to 3 litres. If you have 100 users on a daily basis this could save up to 1100,000 litres annually. volumes from 11 litres to 9 litres per flush.