Before the mid-1990s, most toilets utilized at least 3.5 gallons of water with each flush. To dispose of this over the top water utilization, the National Energy Policy Act confirmed that all toilets produced after 1995 must utilize 1.6 gallons or less. Today, all new flushing toilets are low flush and can carry out the occupation similarly as viably as the more water-concentrated adaptations, without all the waste.
For further more info: http://simpletoilet.com/best-flushing-toilet/
