For example, a family with a water-flush toilet would use at least 100,000 litres of water per year for flushing.
Today there is a significant move towards using less water for flushing flush toilets. This has resulted in the emergence of low flush toilet designs and national standards on water consumption for flushing. In addition, some people modify their existing high flush toilet to use less water by placing a brick or water bottle into the toilet's water tank. Other modifications are often done on the water system itself; i.e. by using greywater, or a system that pollutes the water more gradually, more efficient use of the water is accomplished.