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Thread: Instant clouding after adding sodium carbonate (pH+)

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    Instant clouding after adding sodium carbonate (pH+)

    My chemistry was:

    FC 15 (on it's way back down after shocking after a pool party)
    pH 7.2
    TA 100
    CH 150-200
    CYA 30
    Water temp ~90-92

    I like to keep the pH around 7.4 and usually use borax to raise pH, but was out of it, so I used pH+ (sodium carbonate) to raise the pH. When I put it in, it instantly clouded the water as it dispersed- a milky white cloudiness. It stayed cloudy all evening and by the next day it had cleared up. Did adding the sodium carbonate cause calcium to precipitate? I added a small amount of ionic clarifier just in case and by the next day it was clear. I have no idea if the filter cleared it or if it was a precipitate that reabsorbed? Any ideas? Not sure if I should use that again (even in a pinch).
    14'x28' vinyl liner inground 3.5-6' deep wedge hopper 15000 gal (used to say 13000- I calculated wrong), 1 hp pump with sand filter, 2 returns, 1 fountain, traditional chlorinated, pool house.

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    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,082

    Re: Instant clouding after adding sodium carbonate (pH+)

    It is fairly common to have sodium carbonate (pH Up) cloud a pool temporarily. The area where it is added gets raised in both pH and Total Alkalinity (TA) where that combination over-saturates the water with calcium carbonate causing cloudiness. As this mixes throughout the entire pool, this usually dissipates and clears as the calcium carbonate dissolves into the water unless the water is over-saturated (i.e. has a high saturation index). So you probably didn't need to use a clarifier and could have just waited, assuming your resulting pH and TA didn't get too high.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    Re: Instant clouding after adding sodium carbonate (pH+)

    Thanks Chem Geek! Was hoping to hear from you.
    14'x28' vinyl liner inground 3.5-6' deep wedge hopper 15000 gal (used to say 13000- I calculated wrong), 1 hp pump with sand filter, 2 returns, 1 fountain, traditional chlorinated, pool house.

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