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Thread: should I be concerned at Chlorine level (too high)

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    should I be concerned at Chlorine level (too high)

    Just arrived at our house - which some of you may already know is rented out most of the time - to find a clear pool but with FC at 15-16ppm

    I left the pool open in the sun all day today - 5 kids been in and out most of the day - temperature of pool is 28C, temp in the shade is about 35C, so bright sunlight. Tested using DPD kit this morning and the FC was at 15ppm. Tested the pool this evening and it was still at 15ppm. I thought it would have dropped but it seems not.

    CC - 0
    CYA level is 60
    TA is 130
    CH is 140
    PH is about 7.6-7.8 but reckon it's on the high side due to chlorine - although marginal.

    I have installed a new Pool Pilot digital, which I am still trying to fine tune to produce the right amount of chlorine, (I've also installed a new Hayward Max Flo VS pump, so lots to play with!) The pool cover was on for 24hrs including during the day preceding my 15ppm result, so would this have raised the FC to this level so quickly? Also, how long can I expect the chlorine levels to remain above 3ppm (reckon this is about right default level? or should it be about 5ppm) with the cover off and the sun shining?
    SWG - Exterior
    12x5M
    90,000 Ltrs /24,000US gallons
    Pool Pilot Digital
    Hayward Max Flo VS
    Polaris 280
    Vinyl liner
    Sand Filter

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    Isaac-1's Avatar
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    Re: should I be concerned at Chlorine level (too high)

    I assume you mean CC not FC where you show FC=0

    Is the SWG running?

    As to suggested levels refer to the CYA / Chlorine chart pool-school/chlorine_cya_chart_shock which shows you are above suggested, but still way below shock level, so swimming should be safe.

    I would suggest you test again tomorrow and post your results, and confirm if the SWG is running / running too many hours per day..

    Ike
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
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    Re: should I be concerned at Chlorine level (too high)

    Plug your numbers into http://www.poolcalculator.com/.. don't forget to make sure your pool size is changed at the top. It will show you what your pool test levels should be.

    Looks to me like 15 FC is below your shock value, so safe to swim in.

    With an SWG and a CYA of 60, your FC should never be given a chance to drop below 3. I would keep it a bit above that for safety sake and peace of mind.

    If your SWG is running, it will keep your FC levels up. With a FC of 15, you may want to turn your SWG off for a day or two... don't forget to test, and let your level come down a bit.
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    Re: should I be concerned at Chlorine level (too high)

    Quote Originally Posted by Isaac-1
    I assume you mean CC not FC where you show FC=0

    Is the SWG running?
    sorry, yes...typo... CC is zero FC is 15 have edited it, thanks!

    SWG is not running, as am trying to lower chlorine level. Will test again tomorrow morning and night and report back to see if the level drops at all. Shock levels according to the chart are 24ppm, so well below this.
    SWG - Exterior
    12x5M
    90,000 Ltrs /24,000US gallons
    Pool Pilot Digital
    Hayward Max Flo VS
    Polaris 280
    Vinyl liner
    Sand Filter

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    Mod Squad jblizzle's Avatar
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    Re: should I be concerned at Chlorine level (too high)

    How are you measuring a FC of 15ppm with the DPD test that maxes out a 5ppm?
    If you are diluting, you are losing accuracy and that may be why it appears to not be dropping.
    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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    Re: should I be concerned at Chlorine level (too high)

    Am using Taylor K2006 DPD kit that should be capable of measuring way up the scale. I am currently doing it in a 10mm water sample.
    SWG - Exterior
    12x5M
    90,000 Ltrs /24,000US gallons
    Pool Pilot Digital
    Hayward Max Flo VS
    Polaris 280
    Vinyl liner
    Sand Filter

  7. Back To Top    #7
    Mod Squad jblizzle's Avatar
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    Re: should I be concerned at Chlorine level (too high)

    So you are using a powder? That is the FAS-DPD kit ... the DPD test is different ... thus the confusion.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    Re: should I be concerned at Chlorine level (too high)

    Quote Originally Posted by jblizzle
    So you are using a powder? That is the FAS-DPD kit ... the DPD test is different ... thus the confusion.
    my apologies...I knew that something was missing!! Yes, powder in a 10ml solution then adding drops until solution goes from pink to clear. just done a test this morning - and if I was doing overnight shock test, I would be happy. Overnight no change from 15ppm, but then I kinda expected that. It does confirm though that there is very little if any demand on the chlorine.
    SWG - Exterior
    12x5M
    90,000 Ltrs /24,000US gallons
    Pool Pilot Digital
    Hayward Max Flo VS
    Polaris 280
    Vinyl liner
    Sand Filter

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