Pool pumps can consume enormous amounts of electricity. The pool pump of a typical backyard pool, if left running 24/7, could use more electricity over a year than all the other appliances in the house combined.
Timers should be installed to control the operation of the pool pump/filter. During high use periods, recommended pump running times range from 4-6 hours a day (i.e. summer), and in low use periods 2-3 hours a day (i.e. winter).
Contact a swimming pool manufacturer or pool technician for the most accurate advice on pool pump timers, heating systems, filtration times and temperature settings for the pool.