Patent ID: 8141179

Claim:
A toilet that includes a toilet bowl, a toilet tank that holds a first quantity ( 62 ) of water but does not release most of it in a flushing, a fill valve in said tank that flows water into said tank at each flushing until a predetermined tank full level is reached and air remains in the top of the tank, and a flush valve that releases water into said toilet bowl in each flushing, comprising: a source ( 42 ) that stores a second quantity of water ( 86 ) and releases a majority of it to the toilet bowl in each flushing; an isolator ( 40 ) that lies in said tank, that holds a quantity of water that is isolated from water in said tank and that has a lower end that extends around said flush valve, so most of the water used in each flushing is limited to water within said isolator and said source; a divider ( 140 ) that divides the volume in said isolator into third and fourth quantities ( 61 , 58 ) that both contain water before each flushing, said fourth quantity ( 58 ) being continuously connected to air in the top of said tank so water flows from said first volume through said flush valve in each flushing; said third quantity ( 61 ) of water of said isolator is connected through valve apparatus ( 142 ) to environmental air, said valve apparatus being manually operable to allow air to flow into the third quantity or to not allow air to flow into the third quantity.