Large swimming pools have at least one recirculation pump, but many have multiple pumps. Pool pump speeds vary based on the pool's operation. Filtration, for example, only requires half the flow rate of running a pool cleaner. Conventional pool pumps, with only one speed, are set to run at the higher speeds required of the pool cleaner and waste energy during filtration operation by running faster than necessary. An ENERGY STAR certified pool pump is much more efficient, can run at different speeds, and can be programmed to match pump speed to pool operation needs. Reducing pump speed by one-half allows the pump to use just one-eighth as much energy. ENERGY STAR certified pool pumps often pay for themselves in less than 2 years, run quieter, and prolong the life of the pool's filtering system.