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Thread: Pool capacity

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    Pool capacity

    I'm not sure if this is the correct place to post this, but the math savvy probably hang around in here.

    I'm over shooting a bit on my calculations and I think the pool size is wrong. Original owners say 36k. I figured 32500 or so.

    I came across a diagram so I wonder if someone smarter than me could take a stab at it. Thanks!



    20 x 40 28k gallon Salt Water Vinyl IGP, Hayward pump and Sand filter

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    Re: Pool capacity

    Ack.. There is a little difference... at the deep end they added a curve... A Roman something or other. It goes about another 4 ft. My guess is it was added as an option to this base style.

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    JasonLion's Avatar
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    Re: Pool capacity

    I get something around 27,000 gallons, though I am not completely sure how to adjust for the "deep end they added a curve".
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Mod Squad JVTrain's Avatar
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    Re: Pool capacity

    I think the deep end of the pool (short edge), they mean there is a circle arc making the deep end longer.

    Like this:
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
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    Re: Pool capacity

    I did some very quick math (40 in * 40 feet * 20 feet * 1.33 in gallons) and got 26.5 K gallons. I just treated it as a box ignoring the deep end, then added 33% more on for that. No way is it 36K.
    20,000 gal in-ground plaster pool with sand filter. Replastered recently. Mostly adding bleach and acid. CYA was high when I took over.

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    Re: Pool capacity

    It is 8 ft deep in the deep end but the strange thing is I measured 8.5 feet from water surface to bottom. Maybe with the Roman end they added a diving board and more depth. But yes the curve looks like the one posted.

    Thanks for your attempts!

    20 x 40 28k gallon Salt Water Vinyl IGP, Hayward pump and Sand filter

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    Re: Pool capacity

    Perhaps i can test with chlorine? Add 128 oz of 12.5 and measure the change? What's the earliest i can test after adding to get an accurate result

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    Mod Squad jblizzle's Avatar
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    Re: Pool capacity

    You can test after 30 minutes or so, but chlorine may not be a good indicator.
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    JasonLion's Avatar
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    Re: Pool capacity

    The most reliable approach is to track the expected vs actual change in levels across a number of different chemical additions, and continue adjusting your proposed volume to minimize the overall error across all of them. There is too much potential testing error in a single addition to get very good results.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Pool capacity

    I came up with 33,000

    shallow end= 800
    two slopes=2016
    deep end= 1600
    this adds up to 4416
    times 7.48 and we get 33,031

    You would need a curve half the size of the shallow end to make it 36k.
    20,000, Inground, Vinyl, Hayward 24in sand filter, Hayward super pump, Hayward heater 250,000

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    Re: Pool capacity

    Makes sense. So for now I should start by reducing my volume from 32 to 28 k for the calculator... given the initial results here?

    20 x 40 28k gallon Salt Water Vinyl IGP, Hayward pump and Sand filter

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    JasonLion's Avatar
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    Re: Pool capacity

    Good plan. Then track how your actual results differ from your calculated results from there.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Pool capacity

    Quote Originally Posted by dagoat1967 View Post
    I came up with 33,000

    shallow end= 800
    two slopes=2016
    deep end= 1600
    this adds up to 4416
    times 7.48 and we get 33,031

    You would need a curve half the size of the shallow end to make it 36k.
    Must have crossed posts because I missed yours when I replied last. The curve doesn't seem to be half the size, but I'll take a pic and see what you think.

    20 x 40 28k gallon Salt Water Vinyl IGP, Hayward pump and Sand filter

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    Re: Pool capacity

    Here is a pic.

    20 x 40 28k gallon Salt Water Vinyl IGP, Hayward pump and Sand filter

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    Re: Pool capacity

    30,000 gal, 20 x 40 ft vinyl, IG, installed 2006
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    Re: Pool capacity

    Thanks, that is useful.

    20 x 40 28k gallon Salt Water Vinyl IGP, Hayward pump and Sand filter

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