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Thread: CH Low

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    Adiharce's Avatar
    Join Date
    Jul 2014
    San Antonio, TX

    CH Low

    I have been monitoring CH for a few weeks and am consistently getting 175. This is really unusual as we live in a very hard water area (lots of limestone). I think the CH was low before we entered this recent rainy season. I can't even buy calcium at a pool store here bc no one has low CH levels!
    Any thoughts or suggestions?

    pH 7.8 (lowering now with MA)
    FC 16 (I am shocking due to recent rain and pollen dump in my pool)
    CC .5
    TA 110
    CH 175
    CYA 40
    Alex D.
    AG, 17500 gal, Plaster, Sand Filter,Pentair WhisperFlo Pump
    Polaris, Master Temp 400 Pool and Spa Heater
    Pentair Chlorine Automatic In-Line feeder

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    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Tucson, AZ

    Re: CH Low

    You can not measure the pH when the FC > 10ppm ... it will read artificially high.

    You could always order some calcium to raise it if you like (Recommended Pool Chemicals), or just maintain your pH a little higher to compensate for the low CH. The CH rises due to evaporation, mine goes up about 120ppm every year.
    Jason, TFP Moderator
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  3. Back To Top    #3
    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: CH Low

    Switch to chlorinating with some Cal-hypo powder. (Leslie's Power Powder Plus) That'll raise CH. Down at the bottom of pool math it will tell you how much every ounce or pound will add, so you'll know how much to buy. Just use it in place of bleach until it's gone. Poolmath will even calculate the daily dose to maintain FC.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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