Pressure Assisted Toilet
Pressure assisted toilets have come a long way in the past few years and are now becoming very efficient and quiet. Unlike standard gravity fed toilets that depend on the force of gravity to flush a toilet when water in a toilet tank is released, a pressure assist toilet uses compressed air or a small water pump to significantly assist their flushing power.
The benefits to you include less water consumption (about 1.1 to 1.4 gallons/flush), a low water consuming toilet that actually flushes, and lower water bills.
It is estimated by the EPA that these high efficiency toilets can save several thousands of gallons of water per year for a family of four over the standard 1.6 gallon/flush toilets installed after 1994.