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Thread: last phase of slam, overnight vs daytime

  1. Back To Top    #1

    Join Date
    Mar 2015
    South Florida

    last phase of slam, overnight vs daytime

    Raised fc level to mustard algae shock level as water is crystal clear and no cc, with cya @ 55 raised to 36. Little more than necessary, but emptied the carboy.

    OCLT: tested 36 at 2 am, 36 at 10 am. No cc.

    10 am to 3 am (long work day ): 36 fc, 0 cc dropped to 22 fc, 1 cc.

    Does the sunlight consumption of chlorine produce cc? I almost never register cc when drop testing. OCLT to me shows slam complete, but daytime cc is interesting, perhaps because i gave a good brushing around 11 am, exposed more organics?
    12,000 gal IG, Diamond Brite, built 1957. 90 sq ft Hayward Star Clear Plus, 1 HP Sta-Rite pump, TF100

  2. Back To Top    #2

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: last phase of slam, overnight vs daytime

    CC's can and will vary throughout the swim season, day and night sometimes even. They are an indicator but not proof positive that you need to do something.

    The 14 ppm drop in your FC is probably a better indicator and combined with the CC's tells me your SLAM is not yet complete.

    I would continue the SLAM for at least 24 more hours until your FC consumption stays down.

    Of coursem we would like to see your OCLT done between early dark and daylioght or as close as possible. I cannot understand why you passed that OCLT based on your other values but I would ignore it and go back to your SLAM values.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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