it relies on the principle of pumping from the low to the high As a work that relies on heavily surge of water. and air pressure which important factor are to make the water tank is a vacuum form gravity between the molecules and the weight of the water plus gravity cause water pressure and Another factor that is indispensable, mass transfer of liquid is the pipe must system to a reasonable size to achieve a strong surge of water because the waterway out the pipe will have a bigger size inlet waterway pipe.