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Thread: Reducing pump speed

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    Join Date
    Jan 2014
    Location
    Perth, Australia
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    Reducing pump speed

    Hello all,

    I have a variable pump speed, with three set speeds. I noticed that I can also manually adjust the speed of the pump for each setting. I have played around with the setting and reduced the low speed settings to 1100rpm from 1375rpm. The sound is much better and barely noticeable.

    Any downside to doing that except for that I will have to up overall pump runtime?

    Thanks!
    IG Fiberglass Pool - Sep/2013
    Pool capacity: 27,700 liter / 7,317 gallons
    Emaux V Series Sand Filters - Model: V700B; Size: 28"; Flow Rate: 89 gal/min
    Viron eVo P320 Pump; Flow rate (low/med/high): 32 gal/min, 56 gal/min, 66 gal/min
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    Patrick_B's Avatar
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    Re: Reducing pump speed

    No, not really, and some will say slower is better in terms of filtering. If it becomes an issue, your pool will tell you if it isn't being filtered enough as it will become obvious in appearance changes.
    TFP Moderator
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  3. Back To Top    #3

    Join Date
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    Re: Reducing pump speed

    So would you recommend lowering the pump RPM even further? I can go to 1000rpm or even less. Is there any point where it becomes less efficient? I could practically have it running all day, at lower RPM the electricity costs are marginal.

    I was told once that "at lower pump speeds the water is not recycled from every corner of the pool", I couldn't find any reliable source that can back it up though.
    IG Fiberglass Pool - Sep/2013
    Pool capacity: 27,700 liter / 7,317 gallons
    Emaux V Series Sand Filters - Model: V700B; Size: 28"; Flow Rate: 89 gal/min
    Viron eVo P320 Pump; Flow rate (low/med/high): 32 gal/min, 56 gal/min, 66 gal/min
    Viron V18 pH Salt Chlorinator + RolaChem RP9 Automatic pH Controller

  4. Back To Top    #4
    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    37,879

    Re: Reducing pump speed

    I am not familiar with your specific pump, but may of the other variable speed pumps are most efficient around 1,000 RPM.

    The only limitation on lowering speed is that your skimmer still needs to be skimming efficiently and any other equipment you have, like a heater or SWG, works with the lower 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

  5. Back To Top    #5

    Join Date
    Jul 2013
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    Waxahachie, Tx.
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    Re: Reducing pump speed

    I am a new pool owner this year and have a VS pump. Yes you can run it at a lower RPM and run the pump for a longer duration with basicially marginal costs. I don't about the affects of filtering at extremely low speeds, but it will take longer to turn the pool water over. I would think that the number of returns in the pool and how they are adjusted would also have an affect.
    I started with mine at 1000 RPM and running it 24/7 because I was not supplied with a on/off timer. My PB said I did not need one because the VS was so efficient. Well, I have since added a timer and now run mine 8-10 hours a day at 1500 RPM, no issues. My pump uses 192 watts at that speed.
    Quote Originally Posted by slepax View Post
    So would you recommend lowering the pump RPM even further? I can go to 1000rpm or even less. Is there any point where it becomes less efficient? I could practically have it running all day, at lower RPM the electricity costs are marginal.

    I was told once that "at lower pump speeds the water is not recycled from every corner of the pool", I couldn't find any reliable source that can back it up though.
    12 x 26 Viking FG IG, Bermuda Model, 3 1/2' to 5', 7000 Gallons, Diamond Series Maya, Hayward 1 1/2 HP Maxflo VS, Hayward Stay Clear Plus Cart Filter C17502(S), Hayward Aqua Rite SWG w/T3 cell, Color Changing FIBERSTAR Lighting, Aqua Bot Supreme Robotic cleaner, Brushed Concrete with CCI Liberty Tan color, Taylor K-2006 test kit, Armor Foundation penetrating concrete sealer(lifetime warranty).

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