A swimming pool pump helps filter and circulate the water at a pool. A pump horsepower determines how quickly the pump can process all of the water. The goal is to allow the pump to sufficiently filter all of the water within an 8 to 10 hour period, in accordance with Pool Supply World. Based upon the size and quantity of your pool, you will need more or less horsepower to filter out the water at that ideal time period. Horsepower could be converted to watts, giving you a guestimate of what your electricity costs might be to operate your own pump.
One horsepower is equal to 745.7 watts. When you multiply 745.7 watts by 2.5 hp, you receive 1,864.25 watts. Energy prices are calculated in kilowatt-hours, and to get kilowatt-hours, you multiply watts by hours and divide by 1,000. Consequently, if you run your pool pump for 2 hours in 1 day, then 1,864.25 multiplied by 8 and divided by 1,000 equals 14.9 kilowatt-hours. If you operate your pump daily for a mean of 30 times a month — 30 multiplied by 14.9 — your pump utilizes 447 kilowatt-hours in per month.