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Thread: Why are the numbers so different

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    Why are the numbers so different

    Hi all, I am a new pool owner. Just finished the pool about two weeks ago. After filling the pool and adding the salt I waited a few days then took sample to the local pool store. They tested and printed me out a list of what to add and target numbers to shoot for. Why is there such a difference in their target numbers and TFP target numbers.

    Pool store
    FC 1-3.
    PH 7.2-7.5.
    TA 125-150.
    CH 175-225.
    CYA 30-200.

    TFP
    FC 3-5
    PH 7.5-7.8
    TA 60-80
    CH 50-300
    CYA 70-80
    Any help on this would be greatly appreciated. Thank you,
    Dadof2
    23k gal, IG, vinyl, Pentair sand filter, 1 hp single speed pump, pool pilot digital swg, Hayward sharkvac. Built May 2013

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    Mod Squad JohnT's Avatar
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    Re: Why are the numbers so different

    Something between misinformation and fraud.

    Our numbers for things like pH take into account how your SWCG affects the water chemistry while theirs doesn't. Our chlorine recommendation takes into account the effect of CYA in the water while theirs doesn't. They flail around trying to compensate for the problems of high CYA because if they admit them the can't sell the pucks that everyone loves.

    They'll try to sell you overpriced baking soda to increase your alkalinity and tell you to increase the calcium hardness to because they don't stop to understand that it doesn't matter for a vinyl pool.

    There test results are almost guaranteed to be significantly wrong as well. Don't trust them until you see evidence that they know what they are doing.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
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    bmann71's Avatar
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    Re: Why are the numbers so different

    Because they are there to sell you chemicals. TFP is here to prevent you from having to do that.

    Of course you still have to add the required chemical (i.e Chlorine, Muratic Acid, Baking Soda, etc) to maintain your pool but not to the level they prefer.

    Your best bet is to throw away the pool store numbers and believe what you read here. I speak from experience.

    by the way, Welcome to TFP.
    Ponduke
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    Re: Why are the numbers so different

    Thank you for your replies. I figured that's what it was just needed to hear it. Now that I have my alkalinity way too high whats the best approach to take to drop it from nearly 200 ppm down to 80 without messing everything else up?
    23k gal, IG, vinyl, Pentair sand filter, 1 hp single speed pump, pool pilot digital swg, Hayward sharkvac. Built May 2013

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    JasonLion's Avatar
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    Re: Why are the numbers so different

    Just lower the PH to 7.2 any time it gets up to 7.8, and slowly over time the TA will come down.
    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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    Richard320's Avatar
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    Re: Why are the numbers so different

    Quote Originally Posted by Dadof2
    Thank you for your replies. I figured that's what it was just needed to hear it. Now that I have my alkalinity way too high whats the best approach to take to drop it from nearly 200 ppm down to 80 without messing everything else up?
    Let me begin with the TFP mantra: Can you post a full set of your test results?

    Frankly, if everything else is in range, don't worry. pH will climb soon enough and when it does, you'll add acid which will also knock down TA.
    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 jblizzle's Avatar
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    Re: Why are the numbers so different

    Welcome to TFP!!!

    Read this and the rest of Pool School:
    pool-school/lowering%20total%20alkalinity
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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  8. Back To Top    #8

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    Re: Why are the numbers so different

    Thank you for all your help. I am new to this and appreciate TFP very much. These are today's test results with the Taylor k-2006.
    FC 3
    TA 200
    CH 170
    CYA 30
    PH 8.0
    Let me know if this sounds like a good plan of attack.
    1. Lower PH with muriatic acid
    2. Run deck jets to aerate
    3. Add cya to bring that up.
    4. Repeat steps 1 and 2 until desired TA is reached.
    Thanks.
    23k gal, IG, vinyl, Pentair sand filter, 1 hp single speed pump, pool pilot digital swg, Hayward sharkvac. Built May 2013

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    Mod Squad jblizzle's Avatar
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    Re: Why are the numbers so different

    1. Add the CYA
    2. Add chlorine
    3. lower the pH
    4. run jets / SWG to raise ph
    5. Repeat 3&4

    FC is more important than lower the TA.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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  10. Back To Top    #10

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    Re: Why are the numbers so different

    Thanks everyone. Very much appreciated
    23k gal, IG, vinyl, Pentair sand filter, 1 hp single speed pump, pool pilot digital swg, Hayward sharkvac. Built May 2013

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    Mod Squad jblizzle's Avatar
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    Re: Why are the numbers so different

    Really 1-3 can all be done within about an hour.

    There is no hurry on lowering the TA.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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