Flush toilet system

In a flush toilet system having a bowl, a reservoir tank wherein water may be stored in a primary body at a predetermined level to establish a predetermined pressure head and means for selectively releasing water from said reservoir tank into the bowl during flushing, the provision of water intake pipe means having a portion extending into said reservoir tank to a water level controlled intake valve having an outlet to said tank, means effective while water is flowing through said pipe means and said intake valve is open for providing a reduced fluid pressure region in said pipe means, and means operative in predetermined timed relation to release of water from said reservoir tank for automatically discharging a predetermined quantity of water into water released from said tank into said bowl at sufficiently high velocity to materially increase the overall energy of the water in the bowl and effect increased efficiency during flushing comprising a sealed pressure tank, a passage connecting said reduced pressure region to said pressure tank and through which water may flow from said pipe means to said pressure tank when said intake valve is closed, an outlet conduit connected at one end to said pressure tank and connected at its other end to discharge water from said pressure tank into said bowl to join water released from said primary body of water, and a control valve in said pressure tank responsive to fluid pressure transmitted through said passage to open or close theoutlet conduit at said one end, said control valve being opened when fluid pressure in said passage is reduced to a predetermined value.