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Thread: CH keeps getting higher every year

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    CH keeps getting higher every year

    Hi. I keep a running record on an excel sheet of all my test measurements. This is our 3rd summer for our pool and we started out with a CH reading of 140 ppm and got it to the correct goal of 300. Every year it has crept up and now after opening we are at 450 ppm! How is that when we have obviously had to replace water for evaporation, etc? We do tend to have hard water in our area (Albuquerque, NM). With our drought, I obviously don't want to have to drain any and replace. Should I be worried about any consequences with this high CH reading?
    I got new test chemicals last summer....perhaps I need to get new again?
    Everything else seems to be in good parameters. We use the Taylor Kit K-2006 (because I bought it before I found the tfp test kits.
    Cheers!
    ~Julie



    30K gunite pool, Pentair VS 3050 pump, Pentair Clean & Clear Plus 520 Cartridge filter, Jandy AquaPure SWG, automatic cover, Intellibrite Pentair LED light, no heater.

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    Isaac-1's Avatar
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    Re: CH keeps getting higher every year

    Have you tested how hard your fill water is? We have at least one member that also has very hard fill water that has rigged a rain catch system to divert CH free water to the pool, something you may want to consider as droughts tend to break eventually.
    Indoor 20x40 35,000 gallon vinyl pool with 1.5 HP 2 speed Jandy FloPro pump, Hayward EC75 Perflex DE filter, 11 4x12 Techno-Solis solar panels w/ Aquasolar controller, Aquabot Turbo T Robot Cleaner. Also LMI metering chlorine dispenser pump and HotSpring Jetsetter
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    Re: CH keeps getting higher every year

    According to our Albuquerque water authority details it gives 7.3 hardness for our particular district. Not sure what that means?

    Our TA is constantly high here, so I tend to keep the ph around 7.2 and let the splashing be the aeration to get the TA down to normal parameters.
    Right now it is high again (140) as we haven't been swimming much yet. Could this be a problem too with the CH?

    Today's readings:
    FC 8.4 ( I had to shock a few days ago as I had a high CC)
    CC .1
    ph 7.8
    TA 140
    CH 450
    CYA 75
    Salt 3000
    Temp 83*
    Cheers!
    ~Julie



    30K gunite pool, Pentair VS 3050 pump, Pentair Clean & Clear Plus 520 Cartridge filter, Jandy AquaPure SWG, automatic cover, Intellibrite Pentair LED light, no heater.

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    Re: CH keeps getting higher every year

    Ch does not leave the pool through evaporation (CYA doesn't, either). Only through splashout and only then if your fill water is noticeably lower than the CH level in your pool.

    Pools throughout AZ and NM have your same issue. Partial drains and refills are the answer but check your fill water CH first.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Richard320's Avatar
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    Re: CH keeps getting higher every year

    Quote Originally Posted by SWpisces
    According to our Albuquerque water authority details it gives 7.3 hardness for our particular district. Not sure what that means?

    Our TA is constantly high here, so I tend to keep the ph around 7.2 and let the splashing be the aeration to get the TA down to normal parameters.
    Right now it is high again (140) as we haven't been swimming much yet. Could this be a problem too with the CH?

    Today's readings:
    FC 8.4 ( I had to shock a few days ago as I had a high CC)
    CC .1
    ph 7.8
    TA 140
    CH 450
    CYA 75
    Salt 3000
    Temp 83*
    The problem is that the minerals in the water don;t evaporate, even though the water does. It's solar distillation. So CH keeps climbing. TA is in the fill water. If you plug your numbers in the pool calculator it will calculate the CSI. If you lower pH and TA a little on your targets you will see that CSI goes down. High CSI predicts scaling. Low CSI predicts plaster etching.

    450 CH is still easily manageable. There's an article in Pool School on how to lower TA.
    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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    Re: CH keeps getting higher every year

    When water evaporates the calcium is left behind. You add water with more calcium, so it gradually increases the CH level in the pool. I start out with about 350 in my fill water and after a couple years (with desert temps and evaporation rates) end up with near 1,000 for a CH level.

    High calcium levels can be managed with out scaling. It requires close monitoring of pH and TA levels to keep the CSI index at or near zero. For full explanation see Pool School.
    chiefwej
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

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    Re: CH keeps getting higher every year

    Ahhh...THANK YOU everyone! Didn't know some of this...that's why I love this forum! so appreciate your brains!! I'll keep a close eye on the ph and TA....

    If I continue to keep my ph at 7.2 and aerate with the splashing I should be good, correct?
    Cheers!
    ~Julie



    30K gunite pool, Pentair VS 3050 pump, Pentair Clean & Clear Plus 520 Cartridge filter, Jandy AquaPure SWG, automatic cover, Intellibrite Pentair LED light, no heater.

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    Richard320's Avatar
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    Re: CH keeps getting higher every year

    Quote Originally Posted by SWpisces
    Ahhh...THANK YOU everyone! Didn't know some of this...that's why I love this forum! so appreciate your brains!! I'll keep a close eye on the ph and TA....

    If I continue to keep my ph at 7.2 and aerate with the splashing I should be good, correct?
    You only know if it's good by testing and plugging in the numbers.

    From my own experience: when CH gets to about 900, you have very little wiggle room on TA and pH to keep CSI neutral. So you're good for a while.
    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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