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Thread: High TA, Low PH, 0 FC, what do I do first?

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    High TA, Low PH, 0 FC, what do I do first?

    Pool Chemistry Problem
    by jaurich » Wed 06 Jul, 2011 19:35

    I have a 21' above ground pool that is having issues. I think my mistake was using tabs with stabilizer, and with 0 chorline for a week or so, I kept adding tabs /shock which raised the CYA level and TA. I read this forum yesterday, and added tap water (city) and added the 182 oz. 6% bleach last night. This morning chorline was still 0. I took a sample to american sales here are their results:

    TC -0
    FC -0
    Alkalinity - 140
    Ph - 6.4
    Hardness - 200
    Stabilizer - 60

    I was told to fix ph to 7.2 first, then add .5 gallon of muriatic acid to fix the TA, then fix chlorine with powder shock vs liquid shock.

    Can someone confirm which issue I should target first.

    Much Appriciated.

    Jeremy from Chicago

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    JasonLion's Avatar
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    Re: High TA, Low PH, 0 FC, what do I do first?

    Raise PH, and then right away add acid to lower PH back down? That doesn't make any sense.

    You need to raise the PH to at least 7.0 right away. PH below 7.0 can damage the pool. Then you need to shock the pool, see How To Shock Your Pool in Pool School.
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    Mod Squad woodyp's Avatar
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    Re: High TA, Low PH, 0 FC, what do I do first?

    Raise the PH........ignore the TA at this point..........and we suggest using bleach to raise your FC.
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    Re: High TA, Low PH, 0 FC, what do I do first?

    I just added 5 lb jug of PH plus. Will test in 2 hrs as directed. That's all I had on hand, probably going to have to make a run.

    Thank you for your comments.

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    Re: High TA, Low PH, 0 FC, what do I do first?

    FC and PH now testing Normal!
    I have a half bucket of pucks left, can I still use 1 / Week without getting into trouble? I will use a liquid shock going forward.

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    dattia's Avatar
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    Re: High TA, Low PH, 0 FC, what do I do first?

    Since you are already looking at a CYA level of 60, I would switch to liquid chlorine now and save those pucks for vacations.
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