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Thread: Adding chemicals at once?

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    mkmscr's Avatar
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    Adding chemicals at once?

    I need to add some CYA to my SWG , vinyl liner pool to bring up my level. I also need to add some baking soda to bring up my TA a smidge. PH is good at 7.6. Always wondered, whats the best order to add these and can I add baking soda and CYA at the same time or should I wait between? I know CYA can decrease PH but I'm not sure how much and if its worth worrying about. Just Cyrus on the forums opinion. Thank you.

    Current levels

    FC 7
    CC less than .5ppm
    PH 7.6
    TA 60
    CH 60
    Salt 3200
    CYA 50
    17x27x37 (24000 gallons) Lagoon Vinyl liner, Hayward Eco VS Pump, Hayward 4350 DE Filter, Auto Pilot SWG, Savi LED Lighting, Maytronics Dolphin M4 Vacuum

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    Smykowski's Avatar
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    Re: Adding chemicals at once?

    Baking soda dissolves fast. I'd add that first, wait 15-20 min, then do CYA.
    33' round, 23,000 gal AG vinyl , 1HP 2spd PowerFlo Matrix downsized with 3/4HP impeller (X2), Hayward S180T 150# sand filter (X2), Hayward H250 NG heater Pool Store year 1 - $850 for 2 months; Pool Store year 2 - $440 for 2 months, TFPC year 1 - $170 for 4 months; TFPC year 2 - $95 for 4.5 months
    The most important article on this site - The ABCs of Pool Water Chemistry

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    duraleigh's Avatar
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    Re: Adding chemicals at once?

    Just Cyrus on the forums opinion
    (Siri, behave yourself! )

    The CYA will have some effect but not enough to adjust for. You can calc it at the bottom of the pooolcalculator, if you like. Ph will rise slowly anyway on it's own.

    I think I would leave TA right where it is for an SWG.

    If you add anyway, they can be done one right after the other.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    pwrstrk's Avatar
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    Re: Adding chemicals at once?

    At the bottom of pool calc ...effects of adding chem's it will tell you how much of x amount of CYA will lower PH.


    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    mkmscr's Avatar
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    Re: Adding chemicals at once?

    I was thinking about leaving the TA alone but seemed a smidge low for TFP SWG recommended levels.
    17x27x37 (24000 gallons) Lagoon Vinyl liner, Hayward Eco VS Pump, Hayward 4350 DE Filter, Auto Pilot SWG, Savi LED Lighting, Maytronics Dolphin M4 Vacuum

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    JasonLion's Avatar
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    Re: Adding chemicals at once?

    Your TA is in the recommended range, so you might as well leave it alone for now. If TA goes down further, then raise it.
    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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