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Thread: Flow rate question for JBlizzle

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    Flow rate question for JBlizzle

    Quote Originally Posted by jblizzle View Post
    There is no real need to know the flow rate. Just set it to be adequate for what you need done like skimming, etc.

    See the article in Pool School about determining pump run time.
    Jason, I thought that knowing your flow rate in GPM will help you set pump operating time such that you turn over pool water once every 24 hrs. I don't understand the "adequate for what you need..." in the reply. I have a similar pump and am struggling with the same issue. Pentair charts assume you you know your pool dynamic head, but I don't. I searched the subject on the net and got conflicting opinions for how to estimate your dynamic head.
    28K gal in-ground, 3 HP Pentair, intelliflo pump, 72 sqft DE Hayward filter.

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    Patrick_B's Avatar
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    Re: Flow rate question for JBlizzle

    Jason will be along shortly.

    Welcome to TFP! Enjoy your time here.
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    Mod Squad jblizzle's Avatar
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    Re: Flow rate question for JBlizzle

    And why could you have have answered, Patrick?

    Adequate for what you need =
    - Enough to close the flow switch on a SWG
    - Enough to activate the pressure switch in a heater
    - Enough that your pool surface is skimmed effectively
    - Enough to run your cleaner
    - Etc

    It is trial and error. No sense in trying to calculate the dynamic head which is both non-trivial and varies with different pump speeds.

    Turn over rate is meaningless and not important in private pools. See: Determine Pump Run Time
    Jason, TFP Moderator
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    Patrick_B's Avatar
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    Re: Flow rate question for JBlizzle

    He asked you... You're better on that than me anyway.
    TFP Moderator
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    Mod Squad Bama Rambler's Avatar
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    Re: Flow rate question for JBlizzle

    Man, I really wanted to answer this, but then I saw that it was directed at JB, so I held off!
    Dave J. TFP Moderator
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    Re: Flow rate question for JBlizzle

    Since I don't run a cleaner and don't have a heater, I cannot immediately tell what is enough. Also, I'm trying to get a $1,000 DWP rebate for installing a Pentair Intlliflo pump. They require that you program the operating time and RPM such that the pool water will be turned over once in 24 hours. To be able to set operating time and RPM, I need to know or estimate the flow rate. Another restriction imposed by DWP is that the pump will operate only between 8pm and 10am.
    28K gal in-ground, 3 HP Pentair, intelliflo pump, 72 sqft DE Hayward filter.

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    Mod Squad jblizzle's Avatar
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    Re: Flow rate question for JBlizzle

    Their requirement is dumb. Ask them how to determine what RPM/flow rate is required to achieve a turn-over ... I bet they have no idea so how are they going to know what is the right setting? Plus you can change the setting right after they leave.

    Turn over and flow rate are meaningless in a private residential pool
    Jason, TFP Moderator
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    mas985's Avatar
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    Re: Flow rate question for JBlizzle

    On this web site it says:

    Run for the minimum time necessary to maintain the water in the condition required by applicable public health standards and comply with California Energy Code calibration, low-speed default, and maximum flow rate requirements
    Which is reasonable.

    https://www.ladwp.com/ladwp/faces/wc...3Docaykvhq1_17
    Mark
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    Mod Squad jblizzle's Avatar
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    Re: Flow rate question for JBlizzle

    Thanks Mark
    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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