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Thread: Help with Water balancing

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    ngc4900's Avatar
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    Help with Water balancing

    Hello
    I just received my new TF-100 refill kit yesterday (all new reagents) and did comprehensive testing of my pool water today. I did a partial drain (70%) in April 15. I tested the CYA three times since I drained the pool and got 20-30 range. I only use bleach for my CL source.

    Here are my results:

    FC-3
    PH-7.5
    CC-0.5
    CYA- 0
    TA - 90
    CH - 200
    Water Temp - 87F

    my concern is the CYA. Prior to doing a partial drain, my CYA was about 50. Now it is zero, the CYA reagent added to the pool water is almost crystal clear. Therefore I postulated that the new R13 reagent that came yesterday was defective. So I used another bottle from last year (APR 2015) and got the same results. My worry is that an indoor pool should be accumulating some CC since it has no sunlight to burn it off.

    What, if anything am I doing wrong, and what do I need to be concerned about.

    Thanks

    Best

    Joe
    Indoor Endless Pool (IG). Aug 2012, 5200 Gal. Vinyl, Pleatco PWW10-M filters, Gecko controller, Laing pump, TFT 100

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    Mod Squad kimkats's Avatar
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    Re: Help with Water balancing

    Trust your test kit.........My guess is that your CYA is low. It might not be 0 but it is low due to the drains.

    When you add CYA go slow in how much you add so as to not overshoot your goal.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Texas Splash's Avatar
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    Re: Help with Water balancing

    Joe, I want to make sure I'm reading the sequence of events correctly. "Before the 70% drains last year, the pool was originally at 50. After the 70% drains you got it down to the 20-30 range. You did the testing yourself back then and recently. Am I correct? If so, before we assume the reagent is bad, let's say you had only 20 ppm. There's a +/- 15 ppm variable on that CYA test, so it could have been much lower than anticipated I suppose. But even if it was 20 after testing 3 times since Apr 15, even when optimally managed, CYA will degrade and slowly become consumed/eliminated over time. In your indoor pool that may only be about 2 ppm each month, but over 6 months that would be almost 20. Add that to any splashout and subsequent water replacement, perhaps that could account for the very low (if nothing) recorded now?
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    Mod Squad pooldv's Avatar
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    Re: Help with Water balancing

    Agreed, you will lose a few ppm each month. And 30 is really the lower threshold for being able to reliably test/read CYA. Was the sample water cloudy at all? If yes, then there was some CYA present. If clear then probably not. I believe that chlorine will also consume CCs.
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    ngc4900's Avatar
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    Re: Help with Water balancing

    Thanks for the help. The water was clear.
    Thanks

    Best

    Joe


    Quote Originally Posted by pooldv View Post
    Agreed, you will lose a few ppm each month. And 30 is really the lower threshold for being able to reliably test/read CYA. Was the sample water cloudy at all? If yes, then there was some CYA present. If clear then probably not. I believe that chlorine will also consume CCs.
    - - - Updated - - -

    Pat,
    You got all the information correct. I think you are right. My CYA was probably lower than what I reported after the drain and probably lower after splash out, water replacement, and degradation.
    Thanks

    Best

    Joe


    Quote Originally Posted by Texas Splash View Post
    Joe, I want to make sure I'm reading the sequence of events correctly. "Before the 70% drains last year, the pool was originally at 50. After the 70% drains you got it down to the 20-30 range. You did the testing yourself back then and recently. Am I correct? If so, before we assume the reagent is bad, let's say you had only 20 ppm. There's a +/- 15 ppm variable on that CYA test, so it could have been much lower than anticipated I suppose. But even if it was 20 after testing 3 times since Apr 15, even when optimally managed, CYA will degrade and slowly become consumed/eliminated over time. In your indoor pool that may only be about 2 ppm each month, but over 6 months that would be almost 20. Add that to any splashout and subsequent water replacement, perhaps that could account for the very low (if nothing) recorded now?
    Indoor Endless Pool (IG). Aug 2012, 5200 Gal. Vinyl, Pleatco PWW10-M filters, Gecko controller, Laing pump, TFT 100

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