Determining the proper size pump you need requires a little research . Luckily, you came to the right place.
1. Determine the number of gallons of water in your pool. One way to do this is by multiplying length times width, times average depth, times 7.4.
2. How many hours per day do you intend to run your pump? You should run your pool long enough to turn over all the water through your system at least once per day. Most people will run their pool between 8 & 10 hours per day.
3. Next, check the size of your pool plumbing. Maximum flow rate through 1 ½ “ piping is 44 gallons per minute. Maximum flow rate through 2” plumbing is 73 gallons per minute.
Now that you have this information you can determine the time your need to run your pool in order to circulate all the water correctly. Your can divide the number of gallons by the number of hours you intend to run your pool. Divide that number by 60 (the number of minutes in an hour) and you will know the flow rate you need.
Pool Size - number of gallons of water in the pool
Turnover Time - time to move entire capacity of pool through filter
Flow Rate - desired flow rate in gallons per minute
35,000 divided by 8 hours divided by 60 equals 73 GPM
35,000 divided by 10 hours divided by 60 equals 58 GPM
24,000 divided by 8 hours divided by 60 equals 50 GPM
24,000 divided by 10 hours divided by 60 equals 40 GPM
18,000 divided by 8 hours divided by 60 equals 38 GPM
18,000 divided by 10 hours divided by 60 equals 30 GPM
If you have a 25,000 gallon pool and want a turnover rate of 8 hours, then you will need a pump with a flow rate of 52 gallons per minute.
If you have a 35,000 gallon pool and want a turnover rate of 10 hours, you will need a pump with a flow rate of 56 gallons per minute.
Example: 18,000 gallon pool with a run time of 8 hours needs a minimum flow rate of 38GPM.
A Hayward super pump 3/4hp has an average flow rate of 47gpm so this would work well on this pool.
8,000 – 18,000 gallon pools the following pumps are recommended:
Hayward Super Pump 3/4 HP
Hayward Max-Flo 3/4 HP
Pentair Super Flo 3/4 HP
Sta-Rite Dyna-Glas 3/4 Hp
18,000 – 30,000 Pools the following pumps are recommended:
Hayward Super II 1 Hp
Hayward Super Pump 1 HP
Pentair Pinnacle 1 HP
Pentair WhisperFlo 1 HP
Sta-Rite Duraglas 1HP
30,000 – 40,000 gallon pools the following pumps are recommended:
Hayward MaxFlo 1.5 HP
Hayward Super II 1.5 HP
Pentair WhisperFlo 1.5 HP
Sta-Rite Duraglas 1.5 HP
For larger pools please contact one of our representatives. The Pool RX will continue to update this post, as we receive new information from vendors and other industry professionals. Our goal is to keep our valued customers informed so they can make the best decision. Check back next week when we will cover what swimming pool filter system you might need.
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Modern high-efficiency motors can consume up to 20% less electricity than the standard motors used in most pools or spas. If you need to replace an existing motor, be sure to specify a high-efficiency motor. Motor and pump size is important, too, since it is cheaper to run a smaller motor for a longer period of time than to run a large motor for short cycles. Be sure to size any replacement motors or pumps according to the smallest specification allowed by the pool or spa manufacturer.
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Swimming pool products such as pool pump, pool heater, pool filter and so on are necessary to keep your pool healthy.
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