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Thread: GPM and Run Time

  1. Back To Top    #1

    Join Date
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    GPM and Run Time

    New so bear with me.
    How do you determine GMP with a VS pump?
    Look through my manual no answer...
    Trying to figure run time for the day so I need to know water turnover rate.
    Thanks,
    D

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    JasonLion's Avatar
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    Re: GPM and Run Time

    There is a complex calculation that can determine GPM, but it really isn't worth doing.

    Turnovers is not what matters. How the water looks is what is important.

    See the article in Pool School on determining pump runtime for more information.
    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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    Isaac-1's Avatar
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    Re: GPM and Run Time

    Like Jason said, what matters is the clarity of the water, not some rule of thumb turn over per day unless you are in a commercial regulated environment. This is different for each pool depending on amount of debris blown in, pool use, etc. So our general suggestions for variable speed pumps is run it as slow as you can and still maintain good skimming action and keep your equipment (SWG, Heater, etc) that requires a certain amount of flow happy. In the case of your suction side cleaner this will probably be a higher level than everything else and you will probably need to program enough high speed run time to keep the bottom clean. Then just cut back on run time until you start seeing water clarity issues, then turn it back up a bit.

    Ike

    p.s. it is best to do this fine tuning with a somewhat dirty filter so you will not drop below minimum flow requirements when the filter gets dirty
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
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  4. Back To Top    #4

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    Re: GPM and Run Time

    Here is my baby... before and after
    Just got done with a complete remodel 2 days ago.
    Resurface, deck, filter system, SWG...

    I have to take really good care of this.
    Attached Images Attached Images

  5. Back To Top    #5

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    Re: GPM and Run Time

    Here is the quick and skinny on the pool.
    We didn't build the pool. Previous owners did.
    They did a BYOP.
    They did it on the cheap.
    They put is a spa filter system.
    The pool got away from me several times for a number of reasons.
    The hardest pool I have ever owned and I owned many.

    The PebbleTec was a greenish blue. As you can see it was white.

    We are in Arizona, and live on a well. The fill water is very hard. Pool was filled by truck with city water. Weather that is better, who the **** knows anymore.

    Nonetheless I have all the best stuff.

    In the mean time till the Pebble settles and is fully cured, I have to hand chemical till we fire up the SWG.

    My intelliflo is insane and I need to determine, when and how long to run it. Thus the initial question.

    If any one can help.


    Current average temps - 108 during the dayl
    Pool temp - 90
    What times to run?
    What durations?
    What speeds?

    Chlorine currently - 3
    pH currently - 7.2 - 7.5 range


    Thanks again in advance.
    D

  6. Back To Top    #6
    Mod Squad jblizzle's Avatar
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    Re: GPM and Run Time

    Welcome to TFP!!!

    Did you happen to read the article that Jason pointed out?
    Here it is: Determine Pump Run Time

    If you want a starting place. Try 1000rpm (most efficient) for 4-6 hours. Maybe split the run time up some in the day some at night.

    If 1000 will not skim well enough, increase the speed.

    Once you start up the SWG, you will have to figure out what speed is required to keep the SWG working ... that may then make you adjust the run time which it turn may require a SWG % adjustment. It is all trial and error.

    - - - Updated - - -

    BTW, What test kit do you have? What is your CYA currently?

    Have you read much of Pool School? These might be a good start to learn our recommendations:
    ABCs of Water Chemistry
    Recommended Pool Chemicals
    Water Balance for SWGs
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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  7. Back To Top    #7

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    Re: GPM and Run Time

    Quote Originally Posted by jblizzle View Post
    Welcome to TFP!!!

    Did you happen to read the article that Jason pointed out?
    Here it is: Determine Pump Run Time


    - - - Updated - - -

    BTW, What test kit do you have? What is your CYA currently?

    Have you read much of Pool School? These might be a good start to learn our recommendations:
    ABCs of Water Chemistry
    Recommended Pool Chemicals
    Water Balance for SWGs
    Yes I read it and will digest it.
    Boy I thought chemistry class was tough...
    Will get the CYA tomorrow and pass the data on...

  8. Back To Top    #8

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    Re: GPM and Run Time

    Here are my values for this morning.

    Cl or FC - 5
    Br - 10
    pH >7.5, pH <7.8
    CYA < 30ppm

    Hope that makes sense...

    I have to get a better test kit...

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