According to utilities offering rebates, the most energy-efficient pool pump --- the only ones that qualify for efficiency rebates --- are multispeed pumps with automatic control systems. Multispeed or energy efficient pool pumps can also significantly reduce the power consumption of a swimming pool by over 65%. The difference over a season can be immense. Pumps come in two-speed, four-speed, and variable-speed models, so you can turn the speed down for regular daily use saving a lot of energy, and use higher settings for more thorough, less frequent cleanings. New energy-efficient pumps also move the water more efficiently for further savings. Since pumps circulate the water to keep it clean, the better they work, the less a filter has to work.