Put a time clock on your pump.  If your pool is heated (other than with solar) set a time clock to start the pump no earlier than 6:00 am.  This is the time when nightly heat losses stabilize.

Don't heat your pool unnecessarily.  Turn off heater when your pool is not used for extended periods.

Manage pool turnover rate. Generally, one complete water turnover per 24 hours will provide adequate filtering.

Pool covers save water. Using a pool cover not only saves energy, but it also reduces water evaporation. For a 450 square foot pool you will save approximately 4,000 gallons annually.

Lower pool temperature.  Lowering your pool temperature not only saves energy but will also reduce the amount of chemicals required to treat the pool.  Sheltering your pool from winds reduces both heat loss and water evaporation.  Decorative landscaping is a creative way to accomplish this.  Fencing is another effective windbreak.

Turn off hot tub when not in use.  An electric hot tub will cost roughly $4 to heat from 70 to 100° F and then about $1 per day to maintain that temperature.  So if you're not going to use your hot tub for the next four days, you will save energy by turning it off.

Lower hot tub temperature.  Lowering the water temperature of your hot tub can significantly reduce your energy use.

Use a hot tub cover.  Cover your hot tub whenever it is not being used; this can save you up to $50 per year if you use electricity to heat your tub.