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Thread: first water test results--ancient pool

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    first water test results--ancient pool

    Hi All,

    Yesterday I got the filter hooked up and the pump running--all is well so far. This morning I took the first water test, using the TF-100 kit. Here are my results (11,500 gallon pool):

    FC: 1
    CC: .5
    TC: .5
    pH: 7.5
    T/A: 120
    CH: 210
    CYA: 0
    Temp: 78F

    If I'm right, I need to get the CYA up to a decent level (30-50), using some stabilizer. Then I can get the FC up to a proper level using good old bleach. I don't quite understand why the TC reading doesn't match a FC + CC sum.

    In any case, I'm off to find stabilizer, and will check back here later in the day.

    all best wishes,
    David
    11,500 gal. rectangular cement, 11 x 28 (built c1930); Hayward S180T sand filter; Hayward Max-Flo II 3/4 HP pump

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    Join Date
    Feb 2008
    Location
    Denton, TX
    Posts
    5,061

    Re: first water test results--ancient pool

    Your TC is exactly that, the sum of your FC and CC. Therefore, your TC is 1.5.

    Yes, other than your FC and CYA being low, it looks pretty good. Get those up and you'll be good to go.

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    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
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    30,077

    Re: first water test results--ancient pool

    Hey,

    My guess is you used the OTO chlorine test (it's in the blue plastic box) to test for TC.

    That is what it tests (TC) but it is very innaccurate.

    Rather than using it to test for an exact number, most folks use it simply to test for the presence of chlorine on a daily basis and then use the much more precise FAS/DPD Test to test for FC and CC which yields a result of TC
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: first water test results--ancient pool

    Okay--late in the day here (7:00 pm CST), and after adding 42 oz of stabilizer and 95 oz of bleach, I'm at somewhere like 5 ppm on chlorine and at 40 on the CYA. The pH has dropped considerably, but I'll attend to that tomorrow.

    I also have some air in the pump strainer: silicone gasket grease on the o-ring helped, but there's enough air leaking in on the suction side--somewhere--to make pressure in the filter quite low (hovering around 6 psi), and produce a stream of v small bubbles in the return. I'll go over the PVC fittings tomorrow.

    cheers,
    David
    11,500 gal. rectangular cement, 11 x 28 (built c1930); Hayward S180T sand filter; Hayward Max-Flo II 3/4 HP pump

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