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Thread: Phosphates ???

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    Phosphates ???

    Hi,

    Just had pool supply store do chemical analysis.

    Pool Supply My readings
    FAC 2 FC 2-4
    TAC 2
    CH 260 CH 225
    CYA 50 CYA 40
    TA 100 TA 80
    pH 8 pH 7.6-7.8
    Acid Demand 2 ?
    Phosphates 200

    I just did my own testing. My questions is about Phosphates, what are they and their effect on pool water? Pool company suggests Phosphate Free to add. Also, Dry Acid to reduce pH.


    Thanks, Patty
    Gunite Pool Inground, Plaster, Built 1982
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    Mod Squad jblizzle's Avatar
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    Re: Phosphates ???

    They are a way for the store to make money. Ignore them and maintain proper FC levels (which you are not btw)

    Search the forum for many discussions about them.
    Jason, TFP Moderator
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    Richard320's Avatar
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    Re: Phosphates ???

    Check out Post 10 for an excellent explanation: http://www.troublefreepool.com/threa...ow-Im-confused
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Mod Squad JVTrain's Avatar
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    Re: Phosphates ???

    Phosphates are algae food. They can contribute to faster algae growth. But if the phosphate restaurant is closed due to adequate FC levels, it doesn't matter how much food is around. Phos Free is a waste of money in a properly maintained pool. Your FC should ALWAYS be 3 or above at 40 ppm CYA.

    Your pH is in normal range, if it creeps to 8, then reduce to 7.4. I would recommend muriatic acid over dry acid as it's cheaper and adds less chemical species to your pool. It does require more caution when using though. Based on your levels your pH is ideal between 7.4 and 7.9.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
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    Waldog's Avatar
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    Re: Phosphates ???

    Quote Originally Posted by JVTrain View Post
    Phosphates are algae food. They can contribute to faster algae growth. But if the phosphate restaurant is closed due to adequate FC levels, it doesn't matter how much food is around. Phos Free is a waste of money in a properly maintained pool. Your FC should ALWAYS be 3 or above at 40 ppm CYA.

    Your pH is in normal range, if it creeps to 8, then reduce to 7.4. I would recommend muriatic acid over dry acid as it's cheaper and adds less chemical species to your pool. It does require more caution when using though. Based on your levels your pH is ideal between 7.4 and 7.9.
    It has been mentioned in the past that phosphates can also be suspected in relation to mustard algae it seems to be the only connection why some pools get it and some don't. Chem-Geek has covered this... he can speak on the subject more.
    Installed May 2014 - 16' x 48" Summer Escapes Pro Series Pool AG Vinyl (6,000 gal) - Intex 2650 Sand Filter - Christmas, FL

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    Re: Phosphates ???

    Quote Originally Posted by Richard320 View Post
    Check out Post 10 for an excellent explanation: http://www.troublefreepool.com/threa...ow-Im-confused
    Now that is praise from on high

    Not sure why you are getting pool store testing. If just curiosity then hope it is satiated. If you are trying to verify your results, don't. The tests in the recommended kits are the most accurate available. Yes, even the CYA test. Just remember, phosphate removers have very nice profit margins. Can't imagine why they push them so much

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