Older toilets use about 3.5 to 7 gallons per flush. Low flow toilets use only 1.6 gallons per flush and save your family between 8,000 and 20,000 gallons of water per year, per toilet. Dual-flush toilets take savings to the next level, because they have two buttons – one for a light flush at 0.9 Gallons and the other for a heavy flush at 1.6 gallons.
Dual-flush toilets have been very popular in Europe and Asia for years. They save an average of approximately 26 per cent more water than single-flush ‘Low-Flow’ models, and you can control when you need more or less water.