A submersible pump pushes water through a pipe and a nozzle to create a particular effect. The water comes from the basin of the fountain or, in more sophisticated water fountains, from a separate tank that automatically refills and is connected to a water outlet. The faster the desired speed of the water flow and height of the spray, the higher the pressure needs to be. Most pumps run on electrical power, but there is an increasing number of solar-powered fountains available.