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Thread: Need Suggestion on chemistry

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    donaldm823's Avatar
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    Need Suggestion on chemistry

    My parents in SC have been having algae problems and after 1 week of Chlorox shocking, all the algae is dead, water still cloudy but clearing via sand filter But the chemistry is so out of wack, they went to the local pool store for water analysis and he suggested the following add. Please let me know what you think as I am concerned over pH. They have a 28000 gal vinyl pool
    FC 9, TC 9
    TA 4
    pH 6.5
    CH 229
    CYA 13

    Store suggested
    add 25lbs baking soda
    add 4 lb of CYA granules
    5 lbs of turbo shock (bag says it's calcium hypo)
    1qt algecide after adding shock
    no filter backflushes for 48 hrs.

    My calcs says he is adding the wrong stuff for pH, and I did not think he needed to shock pool based on the FC and TC. I also would not have added algecide until after the shock wears off and FC less than 10ppm
    Don SW Florida
    10,000 gal in ground concrete pool
    Pentair Cartridge filter, Pentair SWG, Pentair Intelliflow VS pump (11018)
    FAFCO solar panels w/Pentair SolarTouch controller
    using BBB for pool chemistry/Lamotte ColorQ tester for daily testing

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    JasonLion's Avatar
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    Re: Need Suggestion on chemistry

    You certainly want to bring up both TA and PH. Starting with about 25 lbs of baking soda sounds about right. You also want to bring CYA up. With a SWG I recommend bringing CYA up to around 70 to 80. I would start with 12 lbs of stabilizer/conditioner/cyanuric acid, give that a week to mix in, test again, and go from there. You also need a little calcium, though I recommend using calcium chloride indtead of cal-hypo to raise the CH level.

    I don't see any need to shock, or to use algaecide.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    donaldm823's Avatar
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    Re: Need Suggestion on chemistry

    Quote Originally Posted by JasonLion
    You certainly want to bring up both TA and PH. Starting with about 25 lbs of baking soda sounds about right. You also want to bring CYA up. With a SWG I recommend bringing CYA up to around 70 to 80. I would start with 12 lbs of stabilizer/conditioner/cyanuric acid, give that a week to mix in, test again, and go from there. You also need a little calcium, though I recommend using calcium chloride indtead of cal-hypo to raise the CH level.

    I don't see any need to shock, or to use algaecide.
    thanks Jason. This question maybe in the wrong section of the forum-if so feel free to move. My question is regarding pH. Is baking soda add the right action, or do I also need to add pH plus or borax?. The pool calculator indicates that pH will only go up .2ph and I am 1.0 low at 6.5. The pool is in SC and is vinyl and they use Tri pucks for FC control. Already added 4lb of CYA for 30ppm. They only added 12lb of the BAking Soda until I could answer the pH question
    Don SW Florida
    10,000 gal in ground concrete pool
    Pentair Cartridge filter, Pentair SWG, Pentair Intelliflow VS pump (11018)
    FAFCO solar panels w/Pentair SolarTouch controller
    using BBB for pool chemistry/Lamotte ColorQ tester for daily testing

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    Re: Need Suggestion on chemistry

    I would use 20 mule team borax to raise the pH and then test the TA once more and adjust it with baking soda if you need to.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    JasonLion's Avatar
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    Re: Need Suggestion on chemistry

    First raise the TA to about 5 or 10 below it's final level with baking soda, which will also raise the PH a bit. Baking soda will raise PH a fair bit if the PH starts really low, but only raise PH a tiny bit once the PH is around 7.0.

    Then measure the PH again and raise it with either borax or soda ash/washing soda/PH Up. Increasing the PH will also increase the TA just a tiny bit, which is why you leave the TA a little low in the first step.

    duraleigh, if TA starts really really low, which it appears to be here, you want to raise TA first. In all other cases, raising TA second is better.
    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: Need Suggestion on chemistry

    duraleigh, if TA starts really really low, which it appears to be here, you want to raise TA first. In all other cases, raising TA second is better.
    I get it. I have seen that posted before, I think, and never quite made the connection. I do now.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    donaldm823's Avatar
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    Re: Need Suggestion on chemistry

    than ks all on the guidance for low pH
    Don SW Florida
    10,000 gal in ground concrete pool
    Pentair Cartridge filter, Pentair SWG, Pentair Intelliflow VS pump (11018)
    FAFCO solar panels w/Pentair SolarTouch controller
    using BBB for pool chemistry/Lamotte ColorQ tester for daily testing

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