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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.

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    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.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    In the Industry

    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
    Perfectly Clear Pool Service, Find me on Facebook!

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