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Thread: Order of adjustments to pool chemistry

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    Join Date
    Jul 2016
    Boca Raton, FL

    Order of adjustments to pool chemistry

    I have often read that you should not add two chemicals to your pool at once, so I am wondering if there is a proper order of operations for adjusting pool chemistry?

    I think I read about this in one of the Pool School articles, but I cannot seem to find it.

    For example, if my PH is out of balance and my Free Chlorine is too low, which should I adjust first? Should I wait a day between adjusting one and adjusting the other?

    12,500 cubic foot pool
    in ground
    gunnite / Diamond Brite
    About 30 years old?
    Pool from City water

  2. Back To Top    #2
    MarianParoo's Avatar
    Join Date
    Aug 2014
    Northern IL

    Re: Order of adjustments to pool chemistry

    Most chemicals can be added at the same time. The exception is when using muriatic acid (MA) and liquid chlorine/bleach. You should wait at least a half an hour between those additions as together they can create dangerous fumes. If pH is significantly out of balance, or you are preparing for a slam, do that add first. Otherwise, do FC first.
    27K IG rectangular; vinyl liner; sand filter; 1hp pump; auto-cover; heater; K-2006.

  3. Back To Top    #3

    TFP Guide
    domct203's Avatar
    Join Date
    Jun 2015

    Re: Order of adjustments to pool chemistry

    As mentioned, chlorine and muriatic acid should never be added, nor stored together. The fumes created are very toxic.

    I usually wait 30 minutes with the pump running between any chemical additions, and when adding items that do not dissipate, like calcium or CYA, I will add half of the amount I need, retest in 30 minutes then add the remainder needed.
    Dom - TFP Guide
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