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Thread: How long do you wait between adding different chemicals?

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    How long do you wait between adding different chemicals?

    Hi everyone

    When I was buying my pool chems at a pool store I was told to wait 2-4 hours between each chemical I was adding. With the BBB method do I still have to wait that long??

    Thanks in advance for your answers!

    Jeannie
    30' above ground pool, 20,000 gallons, BBB method

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    Join Date
    Jun 2008
    Location
    Marana, AZ
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    347

    Re: How long do you wait between adding different chemicals?

    At least wait 1 hour between adding bleach and muriatic acid. Otherwise, you can make chlorine gas. That's bad news. Other than that, I don't know of any wait times between adding chemicals.
    Above ground soft side Omega pool
    20 feet diameter, 4 feet deep
    Hayward sand filter
    Hayward 1 HP Matrix pump
    Hayward Aquabug Automatic Pool Cleaner

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    JasonLion's Avatar
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    May 2007
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    Silver Spring, MD
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    Re: How long do you wait between adding different chemicals?

    The only time you need to wait longer than an hour, with the pump running, is when adding calcium. You don't want to do anything that raises the PH for 24 hours after adding calcium. So no borax, PH Up, soda ash, washing soda, baking soda, cal-hypo, or bleach for 24 hours after adding calcium.
    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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    Join Date
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    Re: How long do you wait between adding different chemicals?

    Quote Originally Posted by JasonLion
    The only time you need to wait longer than an hour, with the pump running, is when adding calcium. You don't want to do anything that raises the PH for 24 hours after adding calcium. So no borax, PH Up, soda ash, washing soda, baking soda, cal-hypo, or bleach for 24 hours after adding calcium.
    Why's that?
    Above ground soft side Omega pool
    20 feet diameter, 4 feet deep
    Hayward sand filter
    Hayward 1 HP Matrix pump
    Hayward Aquabug Automatic Pool Cleaner

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: How long do you wait between adding different chemicals?

    Combining calcium additions and PH increases tends to lead to calcium clouding. If your calcium saturation index (CSI) is very low this is not a problem and there is no timing constraint. But as the CSI increases it is more difficult for calcium to remain dissolved in the water. As you add chemicals, they don't mix throughly all at once. There can be spots in the water that have locally high CSI values for a period of time, which will precipitate calcium particles, which can cause white clouds in the water or calcium scaling on the pool surfaces.
    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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