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Thread: Chlorine levels not going down pool still not clear

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    Join Date
    May 2015
    Location
    Northbrook, IL
    Posts
    18

    Chlorine levels not going down pool still not clear

    So I started SLAMing my pool on Tuesday. I have a 23000 gallon vinyl chorine pool. Kept FC at 16 and it would go down every couple hours to 12 and I would raise it back up using the pool calculator.
    Last night I brought the FC to 16 and this morning when I measured FC was at 22. It's currently 85 and sunny and its been 6 hours since this mornings measurement. I measured again and it was still at 22.
    Can anyone help me understand why the chlorine is not going down? Pool still a light blue, can't see the bottom.

    CYA - 30
    TA - 50
    FC - 22
    CC - 1.5

    what am I missing here? I am planning on getting the CYA to 40-50 and TA to 90-100. But it concerns me that FC is not dropping with all this sun and cloudiness in the pool.
    23,000 gallon in ground vinyl chlorine pool
    hayward pump and sand filter with polaris booster pump

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    borjis's Avatar
    Join Date
    Aug 2014
    Location
    Pacific NW
    Posts
    2,058

    Re: Chlorine levels not going down pool still not clear

    Are you running the pump 24/7 for now and brushing daily?

    It's pretty rare to have a pool slam go quickly....give it a week at least.

    When you get to it, you might bring the TA to 80 first then see what that does to your ph over a few weeks.
    unless you have learned that over time your ph is more stable at 90-100.
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
    (1.5 HP motor) Raypak PR266AEN (266k btu) gas heater. TF-100 Test Kit.
    Dolphin E10 Cleaning Robot.

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    duraleigh's Avatar
    Join Date
    Apr 2007
    Location
    Sebring, Florida
    Posts
    30,084

    Re: Chlorine levels not going down pool still not clear

    Last night I brought the FC to 16 and this morning when I measured FC was at 22
    So is there any way to increase FC without you adding it??? No.....never. so the 22 ppm that you read was testing error or dosing error. FC cannot increase in a pool on it's own.

    Also, if your pool is in daylight, the FC will go down...virtually nothing can stop it because FC is consumed by UV rays from the sun.

    Review your testing and dosing procedures and you will likely find the answer.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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