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Thread: Pool Calculator Question

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    Pool Calculator Question

    Probably the dumbest question ever, but what is the difference between the two weights that show on the pool calculator?

    volume vs. weight?
    Chesterfield, MO
    In Ground vinyl liner pool
    - Lagoon Shape - 40'x30'x20'
    - Intelliflo VS Pump
    - Intellichlor Salt System
    - Triton II Sand Filter
    - Pentair MasterTemp Heater
    - EZ Touch Controller
    - Faux stone water feature with sheer descents
    - Turbo twister slide

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    Smykowski's Avatar
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    Gurnee, IL (North Suburban Chi-town)
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    Re: Pool Calculator Question

    Think measuring cup versus kitchen scale.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
    The most important article on this site - The ABCs of Pool Water Chemistry

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    Re: Pool Calculator Question

    Right - but they both say ounces. That's what is throwing me off.
    Chesterfield, MO
    In Ground vinyl liner pool
    - Lagoon Shape - 40'x30'x20'
    - Intelliflo VS Pump
    - Intellichlor Salt System
    - Triton II Sand Filter
    - Pentair MasterTemp Heater
    - EZ Touch Controller
    - Faux stone water feature with sheer descents
    - Turbo twister slide

  4. Back To Top    #4
    Smykowski's Avatar
    Join Date
    Sep 2011
    Location
    Gurnee, IL (North Suburban Chi-town)
    Posts
    3,065

    Re: Pool Calculator Question

    16oz. to a pound for weight.

    16 oz. per pint for volume.

    Fluid oz. are not the same as a weighed oz., & not all powdered chemicals have the same density.

    Bottom line, if you're going to measure with a scale, use the "by weight" number. If you're going to use a measuring cup, use the "by volume" number.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
    The most important article on this site - The ABCs of Pool Water Chemistry

  5. Back To Top    #5

    Re: Pool Calculator Question

    I feel like I'm a relatively smart person, and I am not getting this. But I think I can move forward if you can confirm:

    If I go by the weight on a box, I should use the weight measurement? example: baking soda.
    Chesterfield, MO
    In Ground vinyl liner pool
    - Lagoon Shape - 40'x30'x20'
    - Intelliflo VS Pump
    - Intellichlor Salt System
    - Triton II Sand Filter
    - Pentair MasterTemp Heater
    - EZ Touch Controller
    - Faux stone water feature with sheer descents
    - Turbo twister slide

  6. Back To Top    #6
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Pool Calculator Question

    Yes, for weight listed on the box use "by weight".
    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

  7. Back To Top    #7

    Re: Pool Calculator Question

    thank you!
    Chesterfield, MO
    In Ground vinyl liner pool
    - Lagoon Shape - 40'x30'x20'
    - Intelliflo VS Pump
    - Intellichlor Salt System
    - Triton II Sand Filter
    - Pentair MasterTemp Heater
    - EZ Touch Controller
    - Faux stone water feature with sheer descents
    - Turbo twister slide

  8. Back To Top    #8

    Join Date
    Jun 2012
    Location
    Louisville, KY
    Posts
    266

    Re: Pool Calculator Question

    Don't worry, my wife is an incredible chef and she still has yet to learn there is a difference between fluid oz and weight.

    I've got a big 4 quart clear plastic drink/kool-aid jug I use for pool chemicals and just always go by volume as there are nice qt and 1/2 qt markings on the side.
    18x36 inground vinyl lined, Hayward sand filter and tablet chrolinator, approx 18k gallon

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