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Thread: Free Chlorine Too High

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    Join Date
    Jul 2013
    Location
    Plainville, MA
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    5

    Free Chlorine Too High

    Discovered this evening that our Free chlorine was 18.8/21.5 (TWO RUNS) based on my taylor testing kit. Last testing was 1.5 weeks ago and it was wnl at 2ppm. My salt generator has been at 65% since opening (3 weeks ago) and had been just fine until 1 week ago. Weather has been warm and solar cover is on when pool is not in use which is 10hrs of 12 hours run time during the week and 5hrs of 12 on saturday and sunday. Is it possible the sun just isn't burning off the chlorine and my swg is set to high? The only other factor is I added 2 bags of fresh'n clear(chlorine free) from my pool store at their suggestion to maintain clarity...they suggested weekly. This was added last monday. I know I can add a neutralizer to lower the FC but wanted to try non-pool store attempts first. I lowered the swg to 30% this evening and left solar cover off. Will this work and how long to lower FC <10ppm. Should I try turning SWG off entirely for a time period?
    This evenings readings:
    FC 21.5
    CC 1PPM
    PH 7.8
    ALK 80
    CALCIUM 290
    CYA 65
    SI 0.3

    Thanks!!!!!
    18*36 Cypress, in-ground, vinyl lined, steel-walled, w/ STA-Rite Sand and filter and pool heater, **Added Hayward SWG 2015**

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    Mod Squad jblizzle's Avatar
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    May 2010
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    Re: Free Chlorine Too High

    Stop adding random chemicals from the pool store ... waste of money.

    With the cover on, you are not losing as much FC to the sun. You need to turn down the output or shorten the run time.

    It is still safe to swim, your FC is lower than the shock level for your CYA.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Join Date
    Jul 2013
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    Plainville, MA
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    Re: Free Chlorine Too High

    AGREED...not adding any more bags of the free & clear! Thanks, needed to hear what I had figured out as well! Last year we had an awful start to using our salt system due to wiring issues from installer. Its kind of like starting over this summer.
    I had checked the chlorine/cya chart and noticed it was lower then the shock level which is why I let kids swim tonight.
    Thanks again!
    18*36 Cypress, in-ground, vinyl lined, steel-walled, w/ STA-Rite Sand and filter and pool heater, **Added Hayward SWG 2015**

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    duraleigh's Avatar
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    Apr 2007
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    Sebring, Florida
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    30,077

    Re: Free Chlorine Too High

    OK to swim.

    Not OK to toss in those wasted chemicals from the pool store.

    I would turn off the SWG and uncover the pool to get your chlorine down rather quickly.........probably a couple of days.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Join Date
    Apr 2008
    Location
    Suffolk, VA, US
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    62

    Re: Free Chlorine Too High

    What Dave said!

    I just learned the hard way 2 weeks ago when I started using a solar cover. In two days, my FC shot up to 21. It took approximately 5 days for it to return to a normal level.

    Lesson learned: either take off the solar cover during day, or shut off the purifier!
    Rectangular Vinyl 20' x 40', 3.5' shallow end, 8' deep end, approx 33,000gal
    1.5 HP Pentair WhisperFlo / 60 gal DE Filter / 2 returns - 1 shallow end wall, 1 deep end floor
    SC-60 SWG / Autopilot Digital Pool Pilot v.4.2 / Polaris 280 w/ Booster Pump
    TF-100 Test Kit

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