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Thread: Dilemma -- Size of Pool

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    Dilemma -- Size of Pool

    We built our in ground gunite pool 11 years ago. There were a number of design iterations, and I recall the size started out at 15,000 gallons (a stock design for this company) but as the county messed with our site plan, I recall seeing a piece of paper that showed the modifications reduced the size to 13,000 gallons.

    Unfortunately, the only paper I've retained over the years all shows the 15,000 gallons so I am wondering if my memory is just incorrect. The pool is curvilinear with no straight sides anywhere so its not just a matter of calculating a volume from length, width, and depth.

    Here's the question: if I can't settle this, what number should I use in calculating amounts of chemicals to add, or assessing the outcomes of tests? 15K, 13K, or pehaps the "happy middle" 14K?
    14,000G Gunite pool, 1-1/2 HP Challenger Pump + 1HP Booster Pump, Waterfall feature, Pentair 60 DE Filter, Polaris 360 Pool Sweep
    Manassas, VA

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    Join Date
    Jan 2010
    Central Valley, CA

    Re: Dilemma -- Size of Pool

    I had a similar issue and I used the pool calc with trial and error to arrive at the number. Pick a number, say 14k gallons. Add a carefully measured amount of MA or Chlorine to adjust pH or FC. If the move is bigger than expected, lower the guess to 13,000 and try again. If you didn't get the full effect, increase the size in calc to 15,000 and so on until you narrow it down.
    Garden Leisure Voyager 12x24 AGP, 7500 Gallons, Hayward Power Flo Matrix 1 HP pump, dual speed, Hayward XStream Cartridge Filter, 120 GPM,

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

    Re: Dilemma -- Size of Pool

    I was told my pool was "about 15,000 gallons." So I used the calculator for 15,000 gallons and kept coming up short. Not by much, but consistent. So I plugged in 15,500 and it got better. At 16,000 everything matched. I've never felt the need to try any higher number, or get it any closer.
    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.
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    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    SouthWest Alabama

    Re: Dilemma -- Size of Pool

    As said, pick a number and start with that. Then adjust the size according to the effect the additions have. You'll be able to get it close enough after several additions of different chems.
    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
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    Join Date
    Mar 2010
    Spring, TX

    Re: Dilemma -- Size of Pool

    I have been trying to figure out the same thing with adding bleach. But when I pick a number and put in what it calls for I was over shoot. When I reduce about half the size it matches up.
    13,000 Plaster IG Pool approx
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    dmanb2b's Avatar
    Join Date
    Apr 2009

    Re: Dilemma -- Size of Pool

    The calculator can't take into account that bleach concentration %'s often vary from the label they are packaged in.
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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    Isaac-1's Avatar
    Join Date
    May 2010
    SW Louisiana

    Re: Dilemma -- Size of Pool

    Also remember bleach looses strength as it ages, so may be stronger than marked when new, so it will maintain its rated stregth for its intended shelf life.

    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
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