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Thread: Shocking process... FC not coming down.

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    Shocking process... FC not coming down.

    I started the shock process on Sunday. Our pool is a round AG 16x48 filled with well water. When I initially tested these were my results...
    FC 0
    PH 7.8
    CYA 0
    TA 210
    CH 500
    I used the pool calc. to make my adjustments and bring it up to shock level. I am now at
    FC 12
    PH 7.5
    CYA 30
    I am getting tons of iron and switching out filters and vaccuming every couple of hours but I still have a green tint to my water (lthough I CAN see the bottom. I would really like to get my sequestrant in but my FC has not gone down at all since Sunday night. My sequestrant reccomends adding it with a FC of 3. Is it normal for the FC to stay so high for so long?

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    JasonLion's Avatar
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    May 2007
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    Re: Shocking process... FC not coming down.

    In an outdoor pool, if CYA is really 30, than you should lose more than 50% of your chlorine each sunny day.

    Again assuming you have an outdoor pool, something is very wrong with either your CYA measurement or your FC measurement.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: Shocking process... FC not coming down.

    Hmm, I'll test again. Could water temp have anything to do with it? It has not gotten above 70 (outdoor temp) since it has been filled.

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Shocking process... FC not coming down.

    Temperature has some effect, but it would need to be a lot colder than that to make a large difference.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: Shocking process... FC not coming down.

    You were right... CYA was at 60 (I think I tested last time too soon) and FC is down to a 7 today! My sequestrant says to put it in when FC is a 3 or less. What is your expert opinion? I am at my target FC level based on the Chlorine/CYA chart. Do you think I'm okay? Water is really clear today but still colored and still getting lots of iron on the bottom and in the filter.

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