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Thread: Help me size a pump

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    Help me size a pump

    I have a pool that holds 9500 gallons of water. According to this article http://www.inyopools.com/HowToPage/h...und_pool_.aspx, based on 8 hours turnover and 50' of head, I need a pump that has 20 gpm flow. That seems to me very low, but if correct that would mean that 3/4 hp super pump would do a job. Now I intend to use Polaris pressure side cleaner. So instead of buying a separate booster pump, I was thinking of installing one of those jandy three way valves to divert part of the water to Polaris. I've seen this setup at my cousins house. So would I then increase a pump to 1 1/2 hp? Or would 1 HP be enough?

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    Mod Squad jblizzle's Avatar
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    Re: Help me size a pump

    Turn over is meaningless. Read: Determine Pump Run Time

    We generally recommend the smallest 2-speed pump that will provide enough flow rate for your needs. IF you have no spa or water features, then a small pump like the 1HP 2-speed Pentair Superflo or Hayward Super Pump would be good (assuming you have 230V available).

    What cleaner do you have? Some pressure side cleaners require a booster and other models do not. So, if you have a cleaner that does NOT required a booster pump, I would think that the 1HP pump should still be adequate on high speed. And you would run on low speed to save money on power when not running the cleaner.

    I would suggest considering a robot instead of a pressure cleaner so that the cleaner is not tied to requiring running the pump on high speed.
    Jason, TFP Moderator
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    Re: Help me size a pump

    Thanks for replying. I have no cleaner yet as I am in a process of putting an equipment list together. I will probably be getting one of the Polaris cleaners. I have seen at my cousins house that he does not run a booster pump for cleaner, but rather just adjust the flow of water to it by Jandy valve. That is what I was planning on doing. He has 25K gallons pool and runs all that with 1 1/2 HP pump. So, mine is smaller, so I am thinking that 1HP would to the job. I would prefer pump that I can hook up to 120V. Seems like Pentair Whisperflo Dual Speed WFDS-24 would fit the bill.

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    Mod Squad jblizzle's Avatar
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    Re: Help me size a pump

    The Whisperflo is a larger pump than the Superflo line of pumps. As such it will use more electricity even is the HP rating is lower. There is a 3/4HP 2 speed Superflo that is also 120V, but a little difficult to locate. This is also a much smaller pump, but should be adequate for a simple cleaner.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: Help me size a pump

    Based on my research I will go with a Superflo, as they are designed for medium head. Now, as to size it seems that 1HP is more efficient than 3/4HP. 1HP at low speed draws 2.3 Amps at 230V where 3/4 HP draws 4.7 Amps at 115V. I think I'll go with a 1HP. How do I find out GPM for this pump?

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    Mod Squad jblizzle's Avatar
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    Re: Help me size a pump

    Why do you need the flow rate? It is not trivial to calculate.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: Help me size a pump

    I was trying to figure out which cartridge size filter to get, and it should not have flow rate lower that pump. Do you have any suggestions which size I should get? Seems like 100 sqft filter should be plenty big for 9500 gallons pool. Pentair cc100 seems like it would do the job.

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    Mod Squad jblizzle's Avatar
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    Re: Help me size a pump

    Well, for cartridge filters, the bigger the better. Using my rule of thumb and given that you will have your pool open year round, I would suggest at least 140 sqft to lower the frequency of cleaning.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: Help me size a pump

    Thanks for your help. Just ordered pump Pentair SuperFlo 1 HP Two Speed Pump 340042 and Hayward C17502 plus filter.

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    Mod Squad jblizzle's Avatar
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    Re: Help me size a pump

    That should be a great setup

    Please add your pool details to your signature as described HERE as it will help us help you.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
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