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Thread: How to figure out run time for pump? Pentair 1HP Whisperflo, single speed

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    Join Date
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    How to figure out run time for pump? Pentair 1HP Whisperflo, single speed

    Hi, I am new to pool ownership and this forum.

    1) We just built our pool and I'm wondering how to figure out pump run time. Our pool tech told us about one hour for every 10 degrees, but I'd like to find a more precise timing.
    2) Is there an ideal time of day to run, i.e. overnight or during the day when we may swim?

    Thank you!
    First time pool owner
    21K IG; quartz plaster finish
    Pentair 1HP Whisperflo pump; Pentair Clean and Clear Plus cartridge filter; Pentair Mastertemp 400K BTU heater
    Polaris 280; Completed Feb. 2017

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    Mod Squad Jimrahbe's Avatar
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    Re: How to figure out run time for pump? Pentair 1HP Whisperflo, single speed

    Ju,

    There really is no one answer...

    Each pool is a little different... You generally run a pump for three reasons:

    1. To keep surface debris moving and being pushed into the skimmers. The more debris the more often you need to run the pump.

    2. You'll need to run it long enough to generate the amount of chlorine needed. In your case via your 3" tab chlorinator..

    3. To circulate the water to ensure the chlorine is effectively distributed throughout the pool. Two or three hours per day is all that is needed for this to happen in most pools.


    Your pool tech's "guess" is just as good as anyone else's guess..

    The only valid way to tell is to measure your CYA level and run the pump long enough to generate the level of FC (Chlorine) required based upon this chart... https://www.troublefreepool.com/cont...art-slam-shock

    Thanks for posting,

    Jim R.
    Finished in 2015 - 17K Gal, IG, 20' x 25' Almost Rectangular Pool, Pebble finish, three rockport water falls. Pentair Equipment: EasyTouch 4, IC40 SWG, 3 HP VS Pump, CCP520 Cartridge Filter.
    TF100 with SpeedStir and SampleSizer, ColorQ Pro 7, Dolphin Premier Robot Cleaner, added Screen Logic 2, added small 3 person Caldera Spa.

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    Join Date
    Mar 2017
    Location
    Houston, TX
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    Re: How to figure out run time for pump? Pentair 1HP Whisperflo, single speed

    Ok, I will have to try it out and see then. Thanks for the reply!
    First time pool owner
    21K IG; quartz plaster finish
    Pentair 1HP Whisperflo pump; Pentair Clean and Clear Plus cartridge filter; Pentair Mastertemp 400K BTU heater
    Polaris 280; Completed Feb. 2017

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    mas985's Avatar
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    May 2007
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    Re: How to figure out run time for pump? Pentair 1HP Whisperflo, single speed

    Quote Originally Posted by JuYuHu View Post
    1) We just built our pool and I'm wondering how to figure out pump run time. Our pool tech told us about one hour for every 10 degrees, but I'd like to find a more precise timing.
    I don't believe there is any scientific basis for that so I would ignore that advise. I run for 2 hours when the water temp is 60-70F. 4 hours when it is 80F+ but not because of water temperature but because of solar.

    Start at 4 hours and if everything is satisfactory, reduce run time until you see too much debris on the surface or you can't maintain FC levels.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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