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Thread: Can I use the Pool Calculator to calculate pool volume?

  1. Back To Top    #1

    Join Date
    Jan 2011
    Riverside, CA

    Can I use the Pool Calculator to calculate pool volume?

    I never had been able to get a "good" number for the volume of my pool. The PB came up with 1 number, I used an online calculator and it came up with another number.

    I've been doing most of the chemical balance based on 25,000 Gal. And most of the time it works out fine.

    I had a very low FC level today, so I brought it up to shock levels. Here are the steps:

    Basic Chlorine test was barely yellow.

    Add about 1.5 Gallons of HASA 12%

    FC tested at 6.5 about 3 hours later -> HASA Liquidator was running as normal

    Added 1 gallon of HASA 12%

    FC tested at 16.5 about 3 hours later -> HASA Liquidator was running as normal

    If I use the final FC and the Middle FC and reverse the calculation on the Pool Calculator to 1 Gallon I get a volume of 12,500 Gallons of water.

    I don't see how this is possible.

    What am I missing?
    40x20 Free Form IG Pool (aprox 29,000 Gal, 140 Perimeter, depth 3'6"-7', Baja Shelf, 8x8 Free Form Spa) - Gunite Shell, Pebble Plaster Finish, Poured Concrete Coping - 3 Deep Heat Returns - Jandy LXi400 Gas Heater (400,000 Btu) - Jandy Variable Speed Pump JEP 2.0 - Jandy CL 600 Filter - HASA Liquidator - Jandy PDA 6 w/ Remote - 4x Jandy WaterColors Pool LEDs - 48" Gas Fire Pit - 6x Gas Tiki Torches - 12'x15' U-shaped BBQ Island (Firemagic Equipment)

  2. Back To Top    #2
    linen's Avatar
    Join Date
    Jul 2010
    Twin Cities, MN

    Re: Can I use the Pool Calculator to calculate pool volume?

    There is a location near the bottom of the that does estimate pool volume but it is limit to round, rectangular, and oval pools. If you want, you can post some dimensions of your pool along with a picture or drawing and we can help estimate.

    Quote Originally Posted by Nightmare
    What am I missing?
    I am not entirely sure, but it does sound like you are fighting something in your water. I would turn off the liquidator tonight, bring the pool up to your shock level and do a OCLT (
    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.

  3. Back To Top    #3
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Can I use the Pool Calculator to calculate pool volume?

    There are way too many unknowns in the situation you describe. The Liquidator is adding chlorine the entire time, the initial test was not a FAS-DPD test, too much time passed between tests, bleach strength varies a fair bit from the listed strength sometimes, and any sunlight on the pool during that period would have completely thrown things off.

    It is possible to get a sense of the size of the pool from measuring before and after chemical additions, but even under ideal conditions this isn't a very precise procedure. The best thing to do is to watch and see if many different chemical additions are consistently off in one direction or another, rather than depending on a single instance.
    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

  4. Back To Top    #4

    Re: Can I use the Pool Calculator to calculate pool volume?

    I think you can use pH and TA to back into a volume if you are pretty accurate with the TA. At least, over time, by observing pH reaction to adding acid when TA is known, you can get a clue if your volume is a bit high or a bit low and tweak your numbers that way.
    23,000 gallon in ground pool with rock waterfall and spillover spa, Aqualink control system, Polaris 380 cleaner, Purex Triton Clean&Clear Plus cartridge filter. Located in The Woodlands, Texas.

    Pool owner since Nov 2008, Trouble Free since April 2009. Happy to help when I can.

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