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Thread: Low CH Causing Cloudiness???

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    CUTiger78's Avatar
    Join Date
    May 2009

    Low CH Causing Cloudiness???

    I'm having a long-term problem with cloudy water, especially noticeable in the deep end (9 feet deep). It started last season and is continuing into this year. Could a low calcium hardness value be the cause?

    Here's why I ask - In 1978, my first job out of college was managing a community pool. "Junior olympic" size (about 25m by 10m) with a 12-foot deep diving tank. I'm guessing about 150K gal. Gunite, plaster finish, about 20 years old. With balanced water, I slowly began to have a cloudiness problem. "Experts" suggested that low CH was causing calcium to leach out of that old plaster. Solution was to add calcium chloride (a lot!) and it worked overnight like a charm.

    My current numbers:
    FC - 13
    CC - .5
    pH - 7.7
    TA - 120
    CH - 120
    CYA - 90 (Yeah, it's high. That's why my FC is 13.)
    Temp - 80
    Filter runs 24/7.

    What say you experts?
    36K gallon 42X22 gunite/plaster kidney-shaped IG;
    1 hp Hayward Super Pump (new in 2012);
    Hayward S244T sand filter w/ Zeosand (both new in 2009);
    175K BTU LAARS Lite2 LG natural gas heater; Polaris 380;
    TF-100 test kit.

  2. Back To Top    #2

    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Low CH Causing Cloudiness???

    High calcium levels can precipitate and cause cloudiness in your water but I cannot see how low CH (which you have) can do that.

    Regardless, you need to bring your CH up anyway so it .

    Nothing in your test results would indicate a cause of cloudiness with one exception.................any time a CYA value is much above 70, my antennae go up. You are doing a good job with your FC and it's obvious you understand the importance but very high CYA pools just seem to have issues.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3
    frustratedpoolmom's Avatar
    Join Date
    May 2007
    SWSuburban Chicago, IL

    Re: Low CH Causing Cloudiness???

    I gotta agree with Dave...never heard of low CH causing cloudiness.
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner

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