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Thread: Flow Rate and Turnover Time

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    Join Date
    Jul 2016
    Location
    Macomb, MI
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    3

    Flow Rate and Turnover Time

    Hi Folks,

    I've been reading all the information on this site and still have a question.

    My pump is rated at 86 GPM, my multiport valve is rated at 75 GPM and my filter is rated at 35 GPM. So for figuring flow rate and turnover time I need to use the lowest rating, correct?

    Steve
    21' x 54" Round (11,700 gal) AG, 1hp Hayward Power-Flo Matrix pump (SP1510Z1XE) with Sand/DE mix filter (S166T).

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    needsajet's Avatar
    Join Date
    Jan 2016
    Location
    Sydney, NSW, Australia
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    3,550

    Re: Flow Rate and Turnover Time

    Welcome to TFP! Good to have you here

    Calculating flow rate requires your pump curve and the head loss from your system, which requires quite a bit of detail about your plumbing and water handling components in the system. Head loss is the resistance to water flow within the circulation system. It's not particularly important to know the flow rate, and you can determine pump run time effectively per this article. Pool School - Determine Pump Run Time

    For interest sake, your pump is probably moving the water somewhere around 30 to 45 gpm when filtering.
    12k IG salt; glass beads in plaster; K-2006C, K-1766, CCL, and Aussie 4in1 (HTH); Pentair Eco800 1.2HP VS; Zodiac SWC 1.3 lb/day (25 g/hr); 25" filter recycled glass; OKU solar panels; 1/2 HP solar pump; Rebel (Warrior) pool cleaner; FlowViz; prior pool AG 10k | Read Before Posting to get the best possible advice | ... and this helped me a lot!: TFPC for Beginners

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    Join Date
    Jul 2016
    Location
    Macomb, MI
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    Re: Flow Rate and Turnover Time

    Thank you! I did read that article but the opening caught my eye.

    "The actual pump run time you need primarily depends on the relative size of your pool, the pump flow rate,..."

    Each component in the system (pump, valve and filter) all have different flow rates that I'm assuming can affect totals as well as plumbing and water handling components.

    I'm going to follow the recommendations in the article and determine what I need for my particular setup.

    Thanks again!
    21' x 54" Round (11,700 gal) AG, 1hp Hayward Power-Flo Matrix pump (SP1510Z1XE) with Sand/DE mix filter (S166T).

  4. Back To Top    #4
    setsailsoon's Avatar
    Join Date
    Oct 2015
    Location
    Stuart/FL
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    418

    Re: Flow Rate and Turnover Time

    Sade,

    Just get the pump curve and check where you are by looking at the pressure on your pump. That's all you need to get the flow rate.

    The various different devices change the discharge pressure but the actual discharge pressure you have corresponds to your actual flow rate. Using the lowest flow rating on any device in the system will not give the correct flow rate.

    I hope this helps.

    Chris

    -Chris-
    2013 In-ground plaster/pebble, screen enclosed, 12000 gal w/ Jandy 2 speed 1 HP pump, Jandy CS 200 cartridge filter, 800 gal spa w/ 1.5 HP booster pump, Solar heater, 2 LED lights in pool 1 light in spa, TF-100 test kit, The PoolCleaner Next Generation, Jandy RS-12 Automation system with iAqualink 2.0 control, Separate Hayward/Goldline Solar control

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