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Thread: Calculating TA/pH/Borate relationship

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    East_Akl_Neil's Avatar
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    Apr 2012
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    Calculating TA/pH/Borate relationship

    Im working on a SS that can be used to log your test results, give a recommendation on what to do, and provide a place to log what you actually did, or anything else of note. I intend using it on my phone to save having to run to the pc and using the poolcalculator.

    I've got most of it working well at the moment but am struggling with the chemical relationships between test measurements and what needs to be added to make corrections if the tests are out of range.

    Is there any equasions that anybody has that I can use for this. I'd rather use a formula than a script so that I can run it on my phone to log results and get recommended changes.


    Once I have this done I'll attach the SS to one of the existing threads with other peoples ones. There will be one issue for a lot of you tho, it's in metric, but should not take too much to convert tho.

    Longer term I plan on creating a process to import the results into a mysql datbase on my home linux server so that I can run queries over it at a later date, and one further day auto log info as I can. But thats a long way down the track at the mo.
    Late 1970's 39000L IG Concrete Pool with Vinyl Liner
    Austral FT55 Sand filter
    Hurlcon E170 Pump Brochure,Manual
    32-40mm Pipe work
    Living in beautiful New Zealand

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    JasonLion's Avatar
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    Re: Calculating TA/pH/Borate relationship

    Calculating PH changes is difficult, the underlying relationship is non-linear. Chem geeks spreadsheet will do it, but the process it uses is rather complex.
    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

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    East_Akl_Neil's Avatar
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    Re: Calculating TA/pH/Borate relationship

    I'll have a look at it and see what I can come up with. My big push into the new place happens in a couple of weeks, so would like to get it done before then if I can. However no big deal if I don't as I can still use it to log test and actions as it is.
    Late 1970's 39000L IG Concrete Pool with Vinyl Liner
    Austral FT55 Sand filter
    Hurlcon E170 Pump Brochure,Manual
    32-40mm Pipe work
    Living in beautiful New Zealand

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    Join Date
    Mar 2007
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    San Rafael, CA USA
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    Re: Calculating TA/pH/Borate relationship

    At the end of the post on pH Buffer Capacity, I give a formula (and link to another web page with more details) that can be used to calculate the amount of acid or base to move the pH a specific amount, but the inverse formula requires iteration (i.e. calculating the effect on pH from the addition of an acid or base). It's still a PITA no matter how you look at it.
    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"

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