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Thread: New Owner - Pool Volume Question

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    delirium330's Avatar
    Join Date
    Dec 2013
    Sacramento, CA

    New Owner - Pool Volume Question

    Hi all, I'm about to start using the pool chemical calculator, and need to determine total volume. My pool is extremely irregular in shape and I want get somewhat specific as to total volume (see picture below). I found the below site's strategy useful to use graph paper and draw the pool to scale (as much as possible) and calculate individual units based on each square and that square's depth (I haven't done this yet).

    What I do know from the building permit is that the surface area of the pool is 390 sq ft. I also know it ranges from 0-6.5 ft in depth, sloping the entire way from the walk in beach area. So I'm trying to deal with the walk in beach area, the steps from the walk in beach to main pool, the main pool itself and its shape, and the little seat shelf in the deep end that you can see in the picture.

    I also attached a screenshot of a volume calculator from that same website above... but nervous about using average depth and I'm assuming the surface sq. ft includes the walk in beach area.

    I'm looking for advice in getting this right, but also looking for input on just how accurate I need to get? I did try calling the pool builder but they are out of business. Thanks.
    Built 2003, 14k Gallons, IG Pebbletec, Primary Pump: Sta-Rite Intellipro VS, Sta-Rite Series 3 S8M150 Cartridge Filter, Fiberstars Jazz Light w/Color Wheel, Polaris 280 Vacuum (Runs Zodiac PB4-60 Booster Pump) and 2 Waterfalls (Run on separate, dedicated 1HP Sta-Rite Max-E-Glas II Pump).

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    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: New Owner - Pool Volume Question

    You could spend hours crunching numbers, but then you'll be missing the volume that's in the pipes, heater, and filter.

    Do the best you can with the math. Dose the pool. Keep track of what you added. If the effects of adding chemicals at the bottom of calc.html indicate you overshot or undershot based on the next test, adjust the volume up or down 500 gallons. Then work your way up or down down again. Within a month or so, you'll probably know within 100 gallons exactly how much water is in there.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Join Date
    Nov 2013
    Los Altos, CA

    Re: New Owner - Pool Volume Question

    Yep, what Richard said is how I did it. My pool is very irregular as well, so I just estimated and adjusted my estimate based on dosing and testing. In truth, it's only a pool so being off one way or another slightly isn't that big a deal.
    Free Form IG Pool with overflow connected Spa. 28K gal. Finished Sept. 2013.
    Wet Edge Primera Stone (Tahoe Coast)
    Intelliflo VS Pump. Paramount Cleaning System. IntelliClor IC40 SWG. Sta-Rite System 3 Cartridge Filter.

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    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: New Owner - Pool Volume Question

    adding to the above, the precision of your calcs should get you within 10-15% or so on the first go 'round.

    Then with some careful calculations and dosing (and then testing) of FC, you will very likely get it closer still.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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