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Thread: Pump/Filter Utilization vs. Temperature

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    Join Date
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    Lakeville, MN
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    Pump/Filter Utilization vs. Temperature

    Hi All,

    I'm planning to integrate my pool filter with my home automation system this summer. One of the things I will be able to do is turn on/off the filter pump depending on certain conditions. I've read the amount of time the filter should running per day depends on the temperature (e.g. on hot days, run the pump continuously, but cooler days, it can be turned off every hour or so for some period of time or at night). I'm wondering if anyone has a good rule of thumb I can use to define how often the pump should run. For example:

    If the temp is above 80, run continously
    If the temp is between 70 and 80, turn off 1 hour every 4 hours
    If the temp is between 60 and 70, turn off 1 hour every 2 hours
    etc...

    Right now I have the ability to monitor current air temp, but I can also add a sensor to monitor water temp if that makes a difference (I'd think air temp would always influence water temp, but I could be wrong).

    Thanks!
    Dan
    Eco Kleer 200 Sq. Ft. Cartridge Filter w/ 1.5 H.P Pool Pump & Motor
    30 Ft. Above Ground Pool

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    mas985's Avatar
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    May 2007
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    Pleasanton, CA
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    Re: Pump/Filter Utilization vs. Temperature

    I've read the amount of time the filter should running per day depends on the temperature (e.g. on hot days, run the pump continuously, but cooler days, it can be turned off every hour or so for some period of time or at night).
    I don't agree with that.

    Chlorine is used up faster with warmer weather so you need more of that but that doesn't always mean you need to run the pump longer (unless you have an SWG).

    I run 4-5 hours per day in the summer but only because of solar and not because of water temp. In winter I run 1-2 hours per day and I would not hesitate doing that in the summer if I didn't need solar. However, I do need to adjust my SWG setting depending on water temperature.
    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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    JoyfulNoise's Avatar
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    Re: Pump/Filter Utilization vs. Temperature



    Agreed. Pump run time has little or nothing to do with air temp. Pool builders, with little or no scientific justification for it, will often tell people to divide the maximum air temperature for the day by 10 and round up to get run time. But there is no justification for doing that; it's simply an "old wives tale"...
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Re: Pump/Filter Utilization vs. Temperature

    Wow only 4 to 5 hours? The guy at the place we get our pool supplies first told us to run it 24/7. After getting my first electric bill, I asked again and he said it is probably ok to shut it down between 11PM and 5AM but to go back to 24/7 if temps stay in the 80s at night. Sounds like I may be running it too long..
    Eco Kleer 200 Sq. Ft. Cartridge Filter w/ 1.5 H.P Pool Pump & Motor
    30 Ft. Above Ground Pool

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    JoyfulNoise's Avatar
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    Re: Pump/Filter Utilization vs. Temperature

    Quote Originally Posted by lagman View Post
    Wow only 4 to 5 hours? The guy at the place we get our pool supplies first told us to run it 24/7. After getting my first electric bill, I asked again and he said it is probably ok to shut it down between 11PM and 5AM but to go back to 24/7 if temps stay in the 80s at night. Sounds like I may be running it too long..
    Its 115F during the day here in the hot part of the summer (Jun/Jul) and "cools" down to 90F at night, if you're lucky. You know what my pump runtime was last summer?

    5 hours per day...at its peak (started off at 4 hours/day but then I bumped it up to add a little extra run time for the suction ckeaner). I could have actually cut it back to 3 hours and I would have been fine.

    Pool was perfectly clean and clear all summer long.


    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    mas985's Avatar
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    Re: Pump/Filter Utilization vs. Temperature

    +1 to what Matt said.

    Somehow the industry has got the mistaken belief that it is run time that prevents algae when it is really all about chemistry.
    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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