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Thread: Types of Chlorine

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    Types of Chlorine

    Hi,


    I been using liquid chlorine but switched to granular cal-hypo 65%. What are the pros and cons of each. It seem less expensive to use cal-hypo.


    Thanks for the help!
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    Mod Squad pooldv's Avatar
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    Re: Types of Chlorine

    Here is an article from Pool School discussing various forms of chlorine, Pool School - How to Chlorinate Your Pool
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    Mod Squad jblizzle's Avatar
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    Re: Types of Chlorine

    See the how to chlorinate your pool article in Pool School for a comparison.

    The short of it is that will add calcium and eventually require replacing water to lower it again. It is also not usually cheaper.
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    Isaac-1's Avatar
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    Re: Types of Chlorine

    The 2 big downsides to Cal-Hypo are that it can cause clouding of the pool water when it is added, and that it increases calcium in the pool water which can be particularly problematic in areas with low amounts of rainfall and high CH fill water like much of the southwest US. Too high of Calcium levels in pools leads to Calcium scaling. For areas like where I live along the gulf coast with very high amounts of CH free rainfall (typically 65+ inches per year) and very soft fill water (less than 60 ppm CH in the tap water) it may be a viable option.
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    Re: Types of Chlorine

    Leslie's told me it didn't raise CYA and I purchased a 5 gallon bucket $154.00. Frustrating!! What should I do? How will impact my water if all is used? My water is in excellent condition since I did reverse osmosis last year.

    My pool is using a gallon of liquid chlorine every three days, seems a little high. I am getting a little yellow algee on the side walls. My CC is at 0.
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    Mod Squad jblizzle's Avatar
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    Re: Types of Chlorine

    Post a full set of test results

    Your pool is big. I would expect you to need to add a bottle of bleach daily. Normal consumption is 2-4ppm of FC a day.
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    Isaac-1's Avatar
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    Re: Types of Chlorine

    It does not raise CYA, but does raise CH for a 27K pool assuming no splash out or overflow from rain it will raise your CH by roughly 100 ppm (assuming this is a typical 50 pound tub), this is of course in addition to however much your CH is raised by replacement fill water and concentration of CH through evaporation. There are many locations in the west with fill water that is already over 400 ppm CH, and in general CH of over about 800 requires careful control of CSI to avoid scaling, so a lot comes down to how much CH is in your fill water, and how much water you have to replace due to evaporation where you live.
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    Mod Squad tim5055's Avatar
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    Re: Types of Chlorine

    Quote Originally Posted by Imracerx View Post
    Leslie's told me it didn't raise CYA and I purchased a 5 gallon bucket $154.00. Frustrating!! What should I do? How will impact my water if all is used? My water is in excellent condition since I did reverse osmosis last year.

    My pool is using a gallon of liquid chlorine every three days, seems a little high. I am getting a little yellow algee on the side walls. My CC is at 0.
    Sorry, but it's time to SLAM that pool. Use only liquid.

    For compression, my pool uses about half of a bottle of liquid every day during the summer, sometimes a little more. Three days on a gallon is not excessive.
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    Re: Types of Chlorine

    Here are my numbers this morning.
    FC 7.5
    CC 0
    CH 425
    TA 110
    PH 7.4
    CYA 40
    85F degrees
    27K Gal, IG Plaster, Hayward EcoStar Variable Pump, Pentair DE FNS Plus Filter 24, Hayward AquaRite with extended life T-CELL-15
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    Mod Squad jblizzle's Avatar
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    Re: Types of Chlorine

    Your CH is already a little high, you could use the cal hypo, but will need to do the reverse osmosis again next year. Have to love the pool store advice
    Jason, TFP Moderator
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