The proposed design incorporates a secondary perforated plate with a flexible piston; detailed view is given in fig. 3, 4 and 5. the piston plate is hinged at the corner of the perforated plate and is connected to the rod (fig. 3). the rod has a flexible joint so that the piston plate can move freely in the vertical direction. the spring is attached to the top of the siphon tube and the perforated plate (fig. 3). initially the spring is relaxed and the flexible piston is also at rest, hence water can pass through the perforated plate (fig. 3). now when the user pulls down the lever, water rises up into the dome and reaches the siphon tube. meanwhile, as the rod is connected to the other end of main rod, the piston plate gets lifted up and closes the perforated plate. now as the user further pulls down the lever, the spring of secondary perforated plate starts compressing, hence storing energy in it (fig. 4). when the user leaves the lever, the spring starts relaxing and thus pushing the perforated plate with the flexible piston. the piston transfers the energy stored in the spring to the water going down the siphon tube. water, which was earlier moving only due to pressure difference due to gravity, will now move down the siphon with greater velocity, because of energy given by the spring. hence, the pressure difference between the inside of the siphon tube and atmosphere will be greater than that developed in old cisterns. water moves down with greater velocity. so, the same work can be extracted out of lesser amount of water. (fig. 6 and 7) looking at this solution from energy point of view, some people might argue that by pulling down the lever, we are just storing energy in the spring instead of giving it to water above plunger plates. the argument is absolutely wrong. some energy is stored in the spring, but this action develops a larger pressure difference (as explained earlier) and it uses the work done by air pressure to increase velocity of water. this idea makes old toilet cistern more effective and efficient just by introducing some changes in the design of the already existing siphon tube. this would be of great help to those who care for nature and its people, but don’t find installing a new toilet as an economically sound idea.