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Thread: OCLT Question(s)

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    ship of fools's Avatar
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    OCLT Question(s)

    i have had good results so far this season and just to make sure everything was ok i did the oclt test last night

    my result at 730 pm last night was FC of 2.5 and this morning at 530 was 2.0 so i only dropped .5 so i believe i passed the test .... my water is sparkling clear as well

    one question is if the only things that reduce FC are sunlight and living organisms why did the results drop by .5 ... testing variations??

    second question is does it make sense to leave the solar cover on during the day, or part of the day, to reduce FC consumption? .... i have read that it is good to have the cover off during the day but would there be a happy medium??
    21,000 gallon inground
    Haywood Sand Filter
    Vinyl Liner

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    ship of fools's Avatar
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    Re: OCLT Question(s)

    in reading a little more i may not have done the oclt correctly

    i tested last night but didn't have the pump running overnight so the water had not been circulating prior to my morning test

    will that change results?
    21,000 gallon inground
    Haywood Sand Filter
    Vinyl Liner

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    Mod Squad zea3's Avatar
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    Re: OCLT Question(s)

    It could influence the result of this morning's test. Let the pump run 30 min and retest.
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    Re: OCLT Question(s)

    one question is if the only things that reduce FC are sunlight and living organisms why did the results drop by .5
    Organics are constantly being introduced into you pool. Even with a solar cover, enough "stuff" can find it's way into your pool to consume SOME chlorine. Remember, though, you are measuring tiny, tiny percentages @ .5ppm (Thank you FAS/DPD test, for being SO accurate) so you are not losing much.

    Yes, not having the pump on could possibly have you drawing a sample from a portionof your water that was not well blended but you passed the test anyway. ALWAYS treat .5ppm loss of FC just as if it were zero.....it's hard to get much better than that.

    Leaving your solar cover on during the day will retain FC.....no doubt about it.

    Remove the cover probably every three days or so.....sunlight is good for your pool
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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