This new design is about using a weight balance system to push the piston downward incase weight of person is not enough to overcome the pressure of the water in the well. This will automate the whole system avoiding a person contact by using the water tank as a counter balance weight when enough weight water enters in to it. In opposite side of the weight balance there will be a load of X Kg enough to push water in the well to Y meter depth. Ideally the load weight and the water tank full of water have same weight. When the water tank is empty the load in the well will push the ground water down ward filling the water tank. As the water tanks starts to fill up it will start pulling the load up balancing the weight which will act as an automatic filling mechanism. When people use the water in the water tank the load will start pushing the piston down ward starting the filling process again.  

3D model is not in actual size shown here.