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Thread: I recalculated my pool volume the right way. Wow!

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    I recalculated my pool volume the right way. Wow!

    Well being a surveyor for 35 yrs I just had to know the true volume vs. the Internet's pool volume calculators.

    I ended up with 10 different sections that I broke out including the steps and there volume.

    Did the calcs and ended up with 2,000 gal less then pool calculators estimate.

    I also wonder if these pool calculators just assumed you have vertical walls or do they take in account that most pool walls slope. Now I Know.

    Some pools like round above ground are fine. But if you have a ig pool with sloping sides no way can you get the correct volume with 4 measurements.
    19,000 gal - Vinyl IG - Sand filter -1.5hp. - Taylor k 2006 - Loop Loc cover

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    pragmatic's Avatar
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    Re: I recalculated my pool volume the right way. Wow!

    Quote Originally Posted by samt
    I also wonder if these pool calculators just assumed you have vertical walls or do they take in account that most pool walls slope. Now I Know.

    Some pools like round above ground are fine. But if you have a ig pool with sloping sides no way can you get the correct volume with 4 measurements.
    It's definitely a "guesstimate" with the Pool Calc's. Actually, it's always a guesstimate, but your method seems more accurate. I was lucky enough to record my water meter readings before and after fill minus about 200 gallons of household use; but still it's estimated
    Dave My Pool Build, ODK Build
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    Richard320's Avatar
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    Re: I recalculated my pool volume the right way. Wow!

    Quote Originally Posted by samt
    Well being a surveyor for 35 yrs I just had to know the true volume vs. the Internet's pool volume calculators.

    I ended up with 10 different sections that I broke out including the steps and there volume.

    Did the calcs and ended up with 2,000 gal less then pool calculators estimate.

    I also wonder if these pool calculators just assumed you have vertical walls or do they take in account that most pool walls slope. Now I Know.

    Some pools like round above ground are fine. But if you have a ig pool with sloping sides no way can you get the correct volume with 4 measurements.
    You can fine tune it even more if you pay close attention to the pool calculator.

    Say the pH is high. You calculate the amount to add. Down below, enter it into the effects section. It will tell you how much the TA should be affected. The next time you test, you see pH might not have dropped enough and TA reads the same. That means you added too little acid, so you increase the volume 1000 gallons. Next time around, maybe you're on the nose and TA has dropped as much as it should have with the two doses. Or not, in which case you adjust the gallonage up or down a little. In a couple weeks, you'll stumble on the right number so all the calculations match what really happens.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    pragmatic's Avatar
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    Re: I recalculated my pool volume the right way. Wow!

    Quote Originally Posted by Richard320
    Say the pH is high. You calculate the amount to add. Down below, enter it into the effects section. It will tell you how much the TA should be affected. The next time you test, you see pH might not have dropped enough and TA reads the same. That means you added too little acid, so you increase the volume 1000 gallons. Next time around, maybe you're on the nose and TA has dropped as much as it should have with the two doses. Or not, in which case you adjust the gallonage up or down a little. In a couple weeks, you'll stumble on the right number so all the calculations match what really happens.
    also a good estimate
    Dave My Pool Build, ODK Build
    22X42 Gunite Freeform 23K Gal, 10X12 Spa
    Diamond-Brite midnight blue, 1800sq. ft Kool Deck
    Pentair Easy-Touch 8, 2-2hp Pentair, 500lb Sand Filter, 400K btu Pentair heater

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    Re: I recalculated my pool volume the right way. Wow!

    Quote Originally Posted by Richard320
    Quote Originally Posted by samt
    Well being a surveyor for 35 yrs I just had to know the true volume vs. the Internet's pool volume calculators.

    I ended up with 10 different sections that I broke out including the steps and there volume.

    Did the calcs and ended up with 2,000 gal less then pool calculators estimate.

    I also wonder if these pool calculators just assumed you have vertical walls or do they take in account that most pool walls slope. Now I Know.

    Some pools like round above ground are fine. But if you have a ig pool with sloping sides no way can you get the correct volume with 4 measurements.
    You can fine tune it even more if you pay close attention to the pool calculator.

    Say the pH is high. You calculate the amount to add. Down below, enter it into the effects section. It will tell you how much the TA should be affected. The next time you test, you see pH might not have dropped enough and TA reads the same. That means you added too little acid, so you increase the volume 1000 gallons. Next time around, maybe you're on the nose and TA has dropped as much as it should have with the two doses. Or not, in which case you adjust the gallonage up or down a little. In a couple weeks, you'll stumble on the right number so all the calculations match what really happens.
    Exactly, it ends up being a percentage calculation you end up applying to fine tune your dosage.
    19,000 gal - Vinyl IG - Sand filter -1.5hp. - Taylor k 2006 - Loop Loc cover

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    harleysilo's Avatar
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    Re: I recalculated my pool volume the right way. Wow!

    Quote Originally Posted by samt
    I ended up with 10 different sections that I broke out including the steps and there volume.

    Did the calcs and ended up with 2,000 gal less then pool calculators estimate.

    I also wonder if these pool calculators just assumed you have vertical walls or do they take in account that most pool walls slope.

    That was what i did for my pool, works well and i know i'm close because the PoolCalculator is very accurate for me.
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