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Thread: CH question

  1. Back To Top    #1
    whataboy's Avatar
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    CH question

    Last month CH was 325
    Last week CH was 350
    Today CH is 375 (tested twice with same results)
    What's causing it to rise? Pool was re-plastered on May 2nd and all my numbers have been in range but now CH is rising
    Added couple trichlor tabs to bring up CYA few weeks ago but it shouldn't have anything to do with rising CH rising.

    Numbers today:

    FC-not checked cause pool still in full sunlight but normally 3.5 to 4 before adding bleach at sunset
    CC-0
    PH-7.6
    TA-80
    CH-375
    CYA-40
    BORATE-45

    Water is crystal clear
    Rick T.
    12,000 gallon IG Kidney shape,gunite,white plaster w/25% blue quartz (Chlorine)
    Jandy LED Multi-color pool light, ,Pentair VS Pump,Pentair FNS 48 DE Filter,Polaris 280 Cleaner
    TF-100 test kit, Taylor K-2006 test kit, Speed Stir, BBB Method, PoolMath, TFPC

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    Mod Squad zea3's Avatar
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    Re: CH question

    Don't let the pH go any higher. Try and keep it around 7.2 Have you tested the CH of your fill water? If you are topping off with high CH fill water that will cause a rise in CH in the pool.
    TFP Moderator
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    whataboy's Avatar
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    Re: CH question

    Fill water CH is 100. Been topping off couple times a week cause its 100 degrees here with lots of sun and no rain for past month.
    Rick T.
    12,000 gallon IG Kidney shape,gunite,white plaster w/25% blue quartz (Chlorine)
    Jandy LED Multi-color pool light, ,Pentair VS Pump,Pentair FNS 48 DE Filter,Polaris 280 Cleaner
    TF-100 test kit, Taylor K-2006 test kit, Speed Stir, BBB Method, PoolMath, TFPC

  4. Back To Top    #4
    whataboy's Avatar
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    Re: CH question

    Quote Originally Posted by zea3 View Post
    Don't let the pH go any higher. Try and keep it around 7.2 Have you tested the CH of your fill water? If you are topping off with high CH fill water that will cause a rise in CH in the pool.
    Just out of curiosity how does lowering PH help rising CH? Thanks
    The CH in my fill water is 100
    Rick T.
    12,000 gallon IG Kidney shape,gunite,white plaster w/25% blue quartz (Chlorine)
    Jandy LED Multi-color pool light, ,Pentair VS Pump,Pentair FNS 48 DE Filter,Polaris 280 Cleaner
    TF-100 test kit, Taylor K-2006 test kit, Speed Stir, BBB Method, PoolMath, TFPC

  5. Back To Top    #5
    Richard320's Avatar
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    Re: CH question

    When water evaporates, CH doesn't. It stays behind. You CH rise sounds perfectly normal to me.

    The pH has nothing to do with CH. But pH & TA & CH in the wrong combination can lead to Calcium Scale formation. That's grow-you-own sandpaper right on the walls. It'll give you roadrash just banging and elbow or knee against it. If you plug your numbers into poolmath it will give you CSI. See what happens to it if you change the pH, TA, and/or CH.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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