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Thread: CH Question

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    elwood58's Avatar
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    CH Question

    We had our pool resurfaced three years ago. Since then, CH has been on the rise due to our hard water here in the desert. We did a water change this week, of about 85% of the water.

    CH is currently sitting at 160, with a Salt Water Pool target of 250. I hate to add Calcium, as the CH will climb on its own. What are the impacts of leaving my CH to climb on its own?
    19204 Gallon L Shape with a 10X10 2nd Step Baja Ledge. Intellichlor IC-40, IntellipH, Cartridge Filter, Pentair Heater/Chiller (Heat Pump). Tons of Deck with Deck Jets. Construction Complete 6/5/17.

    "If you don't measure it, you can't manage it!"

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    JasonLion's Avatar
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    Re: CH Question

    You need to adjust TA and or PH up a little bit to compensate for the low CH level. This is the same as when CH is high, you lower TA and or PH to compensate. To figure out how far they need adjusting you can use the CSI calculator that is part of PoolMath. Aim for a CSI of between -0.5 and +0.3.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Mod Squad jblizzle's Avatar
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    Re: CH Question

    I did the same thing a few years ago, started around CH of 130ppm. I just kept the pH on the higher side and as you replace water from evaporation, the CH is going to climb. I think I am approaching 500ppm now after a couple years.
    Jason, TFP Moderator
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    duraleigh's Avatar
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    Re: CH Question

    How long will it take to get above 250? Probably not a problem but see where it is in 30 days. If it looks like it'll take 6 months, that's longer than I would like to be below normal
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
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    Mod Squad jblizzle's Avatar
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    Re: CH Question

    FYI, here is how my CH tests generally looked:
    4/2013 130ppm
    9/2013 250ppm
    5/2014 320ppm
    9/2014 400ppm
    3/2015 450ppm

    I figure next spring I might replace bunch of water to lower it back down ... so I am on about a 3 year schedule to keep the CH reasonable, probably could push it to 4 years if I added pH automation (I don't test often enough )
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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