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Thread: Question about stepping down my pump speeds and run times

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    Tonedeaf's Avatar
    Join Date
    Jun 2008
    East of Dallas

    Question about stepping down my pump speeds and run times

    2 weeks into our pool start up and have a few questions now that the pool isn't showing sings of plaster dust and the water is balanced appropriately.

    I will be introducing salt into the pool in about 2 weeks and get the SWG cell started.

    As it stands now the Intelliflo 4x160 pump has been running 24/7 for the past 2 weeks. 2 speeds have been programmed into the SunTouch Controller. Low = 1750rpm and High = 3450rpm. Low is approx 70gpm and I think high is approx 140 gpm. This would give me a pool water turnover of about 3.36hrs on Low and 1.6hrs on High.

    Any advice on scheduling pump running times with this info? I am not sure if I want to run on Low for 7 hours or on High for 3 hours to get the water to turn 2 times per day.

    I am thinking on Low for a longer period to give the SWG time to do what it needs to do.
    14100 gallon IG Gunite Pool
    Sapphire Smoke Quartz Plaster
    Pentair SunTouch Controller, Intelliflo 4x160 Pump, 520 Cartridge Filter, Intellichlor SWG System
    Legend Platinum Cleaner with booster pump
    My Pool Build

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    MikeInTN's Avatar
    Join Date
    May 2007
    Middle Tennessee

    Re: Question about stepping down my pump speeds and run times

    Most folks with two speed pumps leave the pump running on low speed for several hours a day, and some I've read leave it on low speed 24/7, and only turn it on high for cleaning the pool. I think you'd be OK leaving it on low speed long enough to get the turnover you desire, whether that be 7 hours or 14 hours.
    24' x 52" AGP - approx 13,500 gallons
    Pentair Optiflo 1 hp/2sp pump w/ Swimpro Voyager 150 sq ft cartridge filter
    Intex 8110 SWCG
    "Fear the Schnauz!"

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Question about stepping down my pump speeds and run times

    The most energy efficient approach is to run the pump many hours a day on a speed much slower than your current low speed, ideally a speed that gives you somewhere between 10 and 20 GPM. You should experiment with the slowest possible speed and see if you get sufficient skimming (sometimes the skimmers don't work very well on extremely low speeds). Adjust the speed up till the skimmer(s) are working well enough and then configure that as your default low speed.
    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

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    mas985's Avatar
    Join Date
    May 2007
    Pleasanton, CA

    Re: Question about stepping down my pump speeds and run times

    I seriously doubt very much that you will get 140 GPM at full speed. You would need very large diameter pipe to accomplish that (i.e. very low head loss) and even with that the pad equipment alone will probably limit flow rates to less than 120 GPM. Typical flow rates for for 2/2 1/2" plumbing are closer to 100 GPM with half speed at about 50 GPM.

    One of the probelms with the 4x160 is that there is no flow rate setting or even a readout so unless you have a flow meter, there is really no way to tell (short of head calcs) how much flow you are actually getting.
    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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    Pool Clown's Avatar
    Join Date
    Sep 2008
    Silicon Valley, CA

    Re: Question about stepping down my pump speeds and run times

    They should package flow meters with those pumps...
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    Jandy/Zodiac, Pentair, Sta-Rite, Raypak, Polaris,
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