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Thread: Should I increase CH?

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    Join Date
    Jul 2010
    Location
    northern California
    Posts
    235

    Should I increase CH?

    Hi everyone,

    I have been wondering for the past few months if I should increase the CH level. My test results for today is:

    FC - 8
    PH - 7.6
    CC - 0.5
    CH - 220
    TA - 80
    CYA - 50
    CSI based on Pool Calculator: -0.21
    Pool water temp. - 68 degrees

    Tested fill water today for the first time: CH - 60

    I noticed that CH dropped to 200 during the winter. We had some really rainy and windy weather and the auto fill was on for about a month now, so I guess CH increased to 220. Question is: Should I increase CH to at least 250 or should I leave it alone? Thanks.
    IG pebbletec pool: size of pool: 27,000 gal; filter: cartridge - Hayward Superstar Clear; pump size: 1.5 HP; TF 100 Test kit - got it on 7-29-10; The Pool Cleaner-4-wheel suction model; Pool calculator: http://www.poolcalculator.com/; bleach calc: http://troublefreepool.com/files/BleachCalc262.exe

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Should I increase CH?

    If you have a plaster pool, then yes, increase CH to 250 or higher, preferably something like 300 so it will still be 250 or higher at the end of the season. There is no need to be in any rush to do this right this moment, but well worth it in the long run.

    If you have vinyl or fiberglass then there isn't any need to increase CH.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Join Date
    Jul 2010
    Location
    northern California
    Posts
    235

    Re: Should I increase CH?

    Thanks, Jason. Somehow the signature was not displayed. It is now. I do have a plaster pool so I will increase CH to at least 300.
    IG pebbletec pool: size of pool: 27,000 gal; filter: cartridge - Hayward Superstar Clear; pump size: 1.5 HP; TF 100 Test kit - got it on 7-29-10; The Pool Cleaner-4-wheel suction model; Pool calculator: http://www.poolcalculator.com/; bleach calc: http://troublefreepool.com/files/BleachCalc262.exe

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    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: Should I increase CH?

    Check your fill water. I'll bet it's got plenty of CH. In which case, the pool CH will go up all by itself through evaporation and refilling. It will go up a LOT.

    If you're worried, add some. But go easy on it. Chlorine comes and goes, but Calcium is forever. In a few months you may be doing partial drains to lower CH, and when you do, you lose the same percentage of CYA and FC. Literally, money down the drain.

    If it were me, I'd plug numbers into Pool Calculator, and if CSI is ±.3, I'd leave it alone.

    editted to add decimal point, thanks Chemgeek!
    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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    Join Date
    Jul 2010
    Location
    northern California
    Posts
    235

    Re: Should I increase CH?

    Hi Richard,

    I did test the tap water which is the same as the fill water and CH is only 60. Since I don't have to be in a hurry to increase the CH level, I will test for it again at the end of this week. We are supposed to have sunny weather in the low 80's all week and no rain.
    IG pebbletec pool: size of pool: 27,000 gal; filter: cartridge - Hayward Superstar Clear; pump size: 1.5 HP; TF 100 Test kit - got it on 7-29-10; The Pool Cleaner-4-wheel suction model; Pool calculator: http://www.poolcalculator.com/; bleach calc: http://troublefreepool.com/files/BleachCalc262.exe

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