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Thread: Run the pump at night or day time?

  1. Back To Top    #1

    Join Date
    Jun 2009
    Central NJ

    Run the pump at night or day time?

    Hi all,

    I'm a pool newbie with a brand new 12 x 24 AG in NJ. I've read through pool school - thanks to all for setting that up, it was a great help. I know how long to run my pump, but my question is when. Is it best to run at night or during the day? I'll be using a solar cover until it heats up if that's a factor.

    Thank you, Dave
    12 x 24 AG in central NJ
    SD40 sand filter 1hp

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Run the pump at night or day time?

    Welcome to TFP!

    It doesn't make a huge difference when your run the pump. Personally, I would run the pump during the day, unless you have time of day electrical rates, in which case you want to run the pump at night.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3

    Join Date
    Aug 2007
    Central Illinois

    Re: Run the pump at night or day time?

    We're on the opposite schedule -- we run it at night after we've been in it all day and stirred up whatever debris might be in there.
    Nikki in IL
    18'x33'x52" AGP, 1.5hp Hayward pump, 200# Hayward sand filter, Aqua-Trol SWG
    "Intex graduate" from a 5400 gal, 18'x48" Intex quick set, crystal clear everyday (with the original Intex equip)for 3 seasons thanks to TFP and BBB

  4. Back To Top    #4
    AnnaK's Avatar
    Join Date
    Jul 2007
    Eastern Pennsylvania

    Re: Run the pump at night or day time?

    We run ours at night because the rates are very much less. There's a 45% rate decrease between 7P and 7A during the week and all weekend. I've found that if the nights are appreciably cooler than the days the water cools down more when the pump is run at night but that's only an issue during the first and last month of the swimming season.

    We run the pump for an hour during the day after the dogs have had their lap swimming to skim the hair off the water surface.

    12,500 gal AGP, Hayward sand filter, Pentair 2-speed pump, timer.
    Please visit our Pool Issues pages for information about step weights, managing the solar cover, and PoolSkim.

  5. Back To Top    #5

    Join Date
    Mar 2009
    eastern washington state

    Re: Run the pump at night or day time?

    our rates are very low, we/I run it 24/7 i know that i dont need to run it that much, i figure more is better!!
    this is just we do
    good luck
    live in eastern washington state
    18x36, Vinyl inground 24k
    Hayward 1 hp filter pump
    1 skimmer/2 returns
    24" sand filter, polaris 280 with booster pump.

  6. Back To Top    #6

    Re: Run the pump at night or day time?

    I run 24/7 on speed 2 and turn it up just when i need to vacuum/circulate chemicals/have fun with jets.

    Intelliflo FTW!

    But as others said... run it when it's cheaper. If there's no difference in price... then it doesn't really matter. Though if you have it on to broadcast bleach when shocking I'd definitely say do it at night, simply to keep your FC up and out of the sunlight.
    Intex 24' by 52" round metal frame vinyl holding about 12,500 gals.
    Krystal clear Model 633 Filter Pump Cartridge 1/2 HP Pump
    TF Test Kit (Thanks Dave) Located Central Texas Coast

  7. Back To Top    #7

    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: Run the pump at night or day time?

    If you have a solar system, then you need to run the pump during the day for it to operate and heat the pool. If you have a saltwater chlorine generator (SWG) system, then it should run during the day to add chlorine that is lost from sunlight if there is no pool cover (with a pool cover and light pool use, then running the pump and SWG at night should be fine).

    From an ideal circulation point of view, running the pump 24/7 at low speed or even every now and then throughout the day and night is better, but this is certainly not required. I also have an Intelliflo variable-flow pump and were it not for my solar system, I'd run the pump on and off throughout the day/night. The main downside to always running it at a very low speed, however, is that you don't get great skimmer vortex action.

    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

  8. Back To Top    #8
    AV8TOR's Avatar
    Join Date
    Dec 2008
    Fort Worth TX

    Re: Run the pump at night or day time?

    We run our during the day during swim season because the pool is cleaner when we swim (thanks to the skimmers). During the winter when the frost guard kicks on we run the filter during late evening when it will be running anyway.
    16,000 gal IG Double Roman Plaster Pool (16yrs - plaster redone 2014)
    Pentair FNS-48 DE filter with WhisperFlo 2HP single speed pump
    Polaris 280 robot
    BBB all the way and tested with a TF100 kit
    Pool Calc user

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