# Pool Pump Operating Costs

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Dear NH,
Can you give me an estimate of the operating cost of running a 3450-rpm pool filter pump per month? It is an 18 x 30' oval above ground. I will be running the pump around the clock for the next few months.
BF

BF,
Ah... how time flies! It seems like only yesterday that we had frost on the Pumpkins and now we're discussing swimming pools! To compute the energy use of your pump, use the following formula:

(Wattage of the pump) x (Hours used per day) / 1000 = Daily Kilowatt-hour (kWh) consumption

Multiply the resulting figure by the "cost-per-kWh" on your electric bill and you will get a good estimate of your daily cost:

(Daily kWh consumption) x (cost per kWh) = Cost per day to run pump.

However, this figure alone is not good enough to judge the actual cost efficiency of a pump. You must go one step further and determine how much it costs you to pump each gallon of water. This is easily determined by looking at the gallons-per-minute (GPM) disclosure (hopefully) on the pump housing or in the owner's manual.

(Cost per day to run pump) / (GPM x 1440) = Cost to pump one gallon of water.

This last figure makes is very easy to compare different pumps. Since more efficient pumps usually come with heftier price tags, you can get a realistic sense of what your extra dollars are buying!

After all, money doesn't grow on trees. Though with the "evolution" of genetic engineering, who knows when we'll be picking bucks off our old magnolias!
NH

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