The energy consumption figures that this calculator provides are estimates based on System Curve "D" performance data. RPM speed selections have been tested in 150 increments and interpolated to achieve selectable options per pump. Actual performance and related energy consumption figures may vary and are dependent upon varying operating and installation parameters and situations, including but not limited to: pipe size and length; type and size of filter, elevation difference between pool and pool equipment, and other plumbing fittings and auxiliary equipment/components installed in the pool circulation system. AstralPool and Zodiac Variable speed pumps may be programmed to operate at varying RPM speeds that increment in 25 steps selected by the user - Adequate RPM speed must be allowed to ensure proper use of all equipment/components installed in the pool circulation system including but not limited to Salt Water Chlorinator Cells and Heaters.