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Thread: Cloudiness and pH

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    ktdave's Avatar
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    May 2007
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    Cloudiness and pH

    Can a pH of 7.9 cause the pool water to all of a sudden become cloudy (slightly)? I accidently forgot to put acid in the pool last night and today the water is dull and a bit cloudy for the first time ever. This is the highest pH I have recorded.

    My numbers from TF100:
    FC 3.5
    CC 0
    pH 7.9 (between 7.8-8.0)
    TA 110
    CH 240
    CYA 80
    SALT 3500
    TEMP 84

    I added 34 oz of 31.45% muratic.
    After a couple of hours the pH is about 7.4.
    I intend to try and lower my PH to 7.0-7.2 to lower TA a bit.
    11,000 gal. gunite w/midnight blue and white pearl PebbleTec
    Intelliflo 4x160 pump
    Intellichlor IC-20 SWG
    Pentair cartridge filter 420 sq. ft.
    Mastertemp 400K BTU heater
    Legend Platinum cleaner
    Pool School
    JasonLion's Pool Calculator
    TF Test Kits

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    divnkd101's Avatar
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    Mar 2007
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    Pearland, TX (Houston Suburb)
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    Ahhhhh, the things you are never told in pool school. These are some of the characteristics you will learn as you become more familiar with your pool. You will know when attention is needed. You too, will be suprised at how much it sparkles once you get the acid back in there. 8)
    MIKE

    21K Inground Custom w/ Spa (Gunite/Plaster), SWCG, Hayward Northstar, Polaris 280, Hayward Color Logics, Jandy PS-8

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    Just to 'clarify' things With your water #s the pH is too high to keep the calcium in suspension. The calcium in your water will try to collect (~) in the water if the alk and pH aren't kept in check. The real chem genusescould tell you exactly what's going on.

    It's not a big problem, as it is, but you want to watch the ballance.

    Good luck Dave!!
    Luv& Luk
    -Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

  4. Back To Top    #4

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    With the numbers that you posted, the calcite saturation index is +0.07 (the traditional Langelier saturation index is +0.22) which is only very slightly over-saturated. However, with my own non-SWG pool, I did notice a small clarity difference between being slightly over-saturated and somewhat under-saturated. With an SWG pool, it is best to run a little under-saturated anyway to prevent calcium buildup on the plates (even though they auto-reverse polarity to help remove such scale). I would suggest a target of around -0.2 for the calcite saturation index which with your numbers would be a pH of around 7.6 though anything in that area should be fine.

    There are so many cumulative errors in measurements that you really just need to find the sweet spot of good clarity for your pool and not have the saturation index way out of whack -- in other words, you don't need to focus on having the index be exact.

    Richard
    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"

  5. Back To Top    #5
    ktdave's Avatar
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    May 2007
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    Thanks guys!

    It appears that this has been a "getting to know your pool" moment. As Divnkd suggested, when I got the ph to around 7.3 and then eventually to 7.1, the water magically was sparkling clear again.

    Thanks for all the usefull info!
    11,000 gal. gunite w/midnight blue and white pearl PebbleTec
    Intelliflo 4x160 pump
    Intellichlor IC-20 SWG
    Pentair cartridge filter 420 sq. ft.
    Mastertemp 400K BTU heater
    Legend Platinum cleaner
    Pool School
    JasonLion's Pool Calculator
    TF Test Kits

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