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Thread: Pool Volume Question

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    Pool Volume Question

    Any math wizzes out there? I'm curious to get a more accurate figure about how large my pool is in gallons. I just added 80 pounds of salt to the pool which increased my salinity by 560ppm. With these known facts, I should have enough data to be able to calculate my pool volume I think.

    Thanks in advance for any help!
    Karl

    Freeform 15x31 Pool w/ oversized spa, 1 1/2 HP Blower, Pentair Quad 60 DE Filter, Heliocol solar panels, Pentair Maxitherm 400K BTU heater, Pentair IC40 SWG, Pentair Easytouch 4 w/wireless remote, Pentair IntelliFlow VSP, and Pentair Intellibrite LED Pool/Spa lights.

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    Administrator Leebo's Avatar
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    Re: Pool Volume Question

    Don't forget the pool calculator has a "Estimating pool volume" section. ;D Should give you a very close idea on your gallons.

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    Administrator Leebo's Avatar
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    Re: Pool Volume Question

    ps.....it looks to be around 5 feet deep.....and holds about 17000 gallons.

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    Re: Pool Volume Question

    Thanks leebo, I saw that too. Just trying get a better estimate by using another method

    Appreciate that fast reply!
    Karl

    Freeform 15x31 Pool w/ oversized spa, 1 1/2 HP Blower, Pentair Quad 60 DE Filter, Heliocol solar panels, Pentair Maxitherm 400K BTU heater, Pentair IC40 SWG, Pentair Easytouch 4 w/wireless remote, Pentair IntelliFlow VSP, and Pentair Intellibrite LED Pool/Spa lights.

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    duraleigh's Avatar
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    Re: Pool Volume Question

    The accuracy of salt test strips is +- 400ppm if that's what you used. A salt drops test is usually +- 200ppm. Digital salt readouts are worse than both of those.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    linen's Avatar
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    Re: Pool Volume Question

    Okay you baited me into it: adding exactly 80 lbs of salt to get 560 ppm at 80 deg. F, I get 17178.59 gallons.

    Of course those bags are not exact weight and there are some impurities in them. Assuming perfectly pure salt, but a +/- 2 lbs per bag (I am assuming each bag is 40 lbs), that gives a range of as low as 16319.66 gallons or as high as 18037.52 gallons...not too bad but...as duraleigh stated your test approach is also inaccurate...a +/-400 ppm means your pool could be as low as 10020.84 gallons, and as high as 60125.06 gallons ...

    combining both of those error sources gives the estimate:

    9519.8 gallons
    to
    63131.31 gallons



    I think you are better off estimating by doing measurements.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Mod Squad jblizzle's Avatar
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    Re: Pool Volume Question



    Posted with Tapatalk ... sorry if I sound short ... hate typing on phone
    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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    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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    Mod Squad Bama Rambler's Avatar
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    Re: Pool Volume Question

    The best way to get a close estimation of the volume is by keeping track of many chem additions and keep adjusting it in the pool calculator until the amount of chems it suggests causes the exact change expected. One or two additions aren't enough to be accurate because of the variability in the chems and measurements.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Pool Volume Question

    Thanks for everyone's replies ... seems that no matter what, there is going to be a huge variation short of using the measuring tape.

    Apreciate everyone taking the time for feedback! Thanks
    Karl

    Freeform 15x31 Pool w/ oversized spa, 1 1/2 HP Blower, Pentair Quad 60 DE Filter, Heliocol solar panels, Pentair Maxitherm 400K BTU heater, Pentair IC40 SWG, Pentair Easytouch 4 w/wireless remote, Pentair IntelliFlow VSP, and Pentair Intellibrite LED Pool/Spa lights.

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    JasonLion's Avatar
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    Re: Pool Volume Question

    There is still a huge variation even when using a measuring tape, unless the pool is exactly rectangular, and even then the water depth varies over time so no number is ever exact.
    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

  11. Back To Top    #11

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    Re: Pool Volume Question

    Another option is to download Google Sketch-Up.

    Measure your pool, and model it in Sketch-UP... it has a Volume calculation for objects.

    That is what I did since I have a deep end with sloped walls. Original owners said pool was 35,000 gallons.

    After measuring with a tape measure and modeling in Sketch-up.. turns out pool is 27,000

    -Craig
    Pool: 20 X 40 Rec - 28,500 gallons;
    Type: IG with Vinyl Liner
    Filter: Hayward 46SqFt DE Filter
    Pump Size: Hayward Super-Pump 1 hp

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