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Thread: High Tot. Chlorine, low Free Chlorine

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    High Tot. Chlorine, low Free Chlorine

    Hey everyone,
    I've been lurking around for few weeks as I am trying to figure my water. I am giving up and need some help. I have a 15ft Intex pool with the intex SWG. I have on order the TF100 test kit and should have it next week. I did have a problem where I was not running the SWG long enough (thanks to some bad test strips). My water was a little cloudy so I brought my pool sample to the local pool store and here are the results:

    FC: .2
    TC: 4.7
    CYA: 120
    TA: 165
    aTA: 129
    pH:7.3
    TH:210
    Minerals: 3500

    The pool store told me to add 3lbs of BioGuard Super Soluble which from the label is Sodium dichloro-s-triazinetrione dihydrate. After doing a lot of reading here on this forum, this will raise my CYA, right? I don't want to do that. How can I lower my Total chlorine and raise my free chlorine? I am starting to use the BBB method so should I just add bleach to my pool?

    Thanks for you help,
    Dan

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    Mod Squad JohnT's Avatar
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    Re: High Tot. Chlorine, low Free Chlorine

    Yes, just add bleach to the proper shock level according to the chart in Pool School http://www.troublefreepool.com/categ...ya_chart_shock for your CYA level. The trichlor will increase your CYA even higher.
    TFP Moderator
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    Re: High Tot. Chlorine, low Free Chlorine

    Thanks for the quick reply. Will my tot. chlorine eventually drop? Do I even need to worry about that?

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    Mod Squad JohnT's Avatar
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    Re: High Tot. Chlorine, low Free Chlorine

    Quote Originally Posted by hobby1
    Thanks for the quick reply. Will my tot. chlorine eventually drop? Do I even need to worry about that?
    The total chlorine isn't really the problem. The problem is the difference between the total and free chlorine. It should be below 0.5ppm.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    JasonLion's Avatar
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    Re: High Tot. Chlorine, low Free Chlorine

    Your CYA level is quite high, which is going to make things a bit more challenging. It would be best if you could lower your CYA level by replacing some water.

    Bringing your FC level up to shock level, around 30 with CYA of 120, will take care of the combined chlorine (CC). TC - FC = CC. Ideally, you want CC to be zero. CC tends to go towards zero if you maintain appropriate FC levels. The cloudiness is probably algae, and you may need to bring it back up to shock level a couple of times to get all of the algae.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    frustratedpoolmom's Avatar
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    Re: High Tot. Chlorine, low Free Chlorine

    I agree, I would replace enough water with fresh water to bring your CYA down to 80 at least, then it will be more manageable. The Intex pool filters seem to take longer to clear the cloudy water, so be sure to have some extra POP make sure you are running the filter 24/7 till it clears.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
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