Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 3 of 3

Thread: Pool Math Question

  1. Back To Top    #1

    Join Date
    Jul 2012
    Location
    Central Texas
    Posts
    436

    Pool Math Question

    In Pool Math, what's the assumed/background calculation number for the percentage of cyanuric acid in the liquid stabilizer? The natural chemistry stabilizer I get is equivalent to 30% CYA and was just wondering what pool math is using since there's no adjustment or drop down for different strengths, like there is for bleach.

    This is merely a curiosity question not any kind of indictment! I love pool math!
    Central TX / 12K GAL / IG / SWG / DE filter / Pentair SVRS & 3 swim jet pumps / Spa bench and jets / Single body of water / No heater.

  2. Back To Top    #2

    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,082

    Re: Pool Math Question

    1 fluid ounce of liquid stabilizer is assumed to be equivalent to 0.387 ounces weight of CYA. Or put another way, one gallon increases CYA by 37 ppm. That is apparently incorrect and should be 32 ppm CYA so PoolMath needs to be changed. Based on the dosing instructions of the product, one gallon should raise the CYA by 32 ppm so one gallon should be equivalent to 42.73 ounces weight of pure CYA so one fluid ounce should be equivalent to 0.334 ounces weight of CYA.

    There is only one liquid CYA product so no need for a pulldown, but a correction needs to be made in PoolMath. The "2890" in the following two pieces of code in PoolMath needs to be changed to "2500":

    function CalcCYA()
    {
    var temp;

    if (parseInt(document.F.CYAfrom.value) < parseInt(document.F.CYAto.value)) {
    // Stabilizer
    temp=(parseInt(document.F.CYAto.value)-
    parseInt(document.F.CYAfrom.value)) *
    GetGallons() / 7489.51;
    document.F.CYA1oz.value=PutWeight(temp);
    document.F.CYA1vol.value=PutVolume(temp * 1.042);
    temp=(parseInt(document.F.CYAto.value)-
    parseInt(document.F.CYAfrom.value)) *
    GetGallons() / 2890;
    document.F.CYA2oz.value=PutVolume(temp);
    document.F.CYApcnt.value="some";
    }
    else {
    document.F.CYA1oz.value=document.F.CYA1vol.value=
    document.F.CYA2oz.value=0;
    if (parseInt(document.F.CYAfrom.value) >
    parseInt(document.F.CYAto.value)) document.F.CYApcnt.value=
    Math.floor(100-(parseInt(document.F.CYAto.value)/
    parseInt(document.F.CYAfrom.value))*100+0.5) + "%";
    else document.F.CYApcnt.value="some";
    }
    }

    :
    case 25: // liquid stabilizer
    result="raise CYA by "+Format(oz / GetGallons() * 2890);
    break;
    This should be tested (I didn't try it, but I think it would be correct).
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

  3. Back To Top    #3

    Join Date
    Jul 2012
    Location
    Central Texas
    Posts
    436

    Re: Pool Math Question

    Thanks Richard. I always wondered why my results were slightly off from PoolMath using liquid stabilizer. I assumed it was always just me reading the test incorrectly. And I'm sure that's most of it, but a calc error could account for a bit of discrepancy as well.

    I didn't know there was only one liquid CYA product. I much prefer that approach over the solid/powder.
    Central TX / 12K GAL / IG / SWG / DE filter / Pentair SVRS & 3 swim jet pumps / Spa bench and jets / Single body of water / No heater.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •