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Thread: Calcium hardness

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    Join Date
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    Calcium hardness

    My current readings
    FC 3.5
    CC .5
    TC 4
    PH 7.2
    TA 50
    CH 130
    CYA 40

    Plaster material has shown up in our vacuum bag. Do I need to go ahead and add calcium? Will that prevent this for happening? What about alkalinity. Fix that at the same time?
    15 K gallons
    Gunnite
    Centurion Pump/Hayward Sand Filter
    Polaris 360 Robot

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    Richard320's Avatar
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    Re: Calcium hardness

    Yes. you need to fix pH, CH, and TA. If you plug your numbers into Pool Calculator, you'll see that CSI is waaaay too negative, -.87 @84F.
    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: Calcium hardness

    Thanks for the quick reply...

    According to the pool calc...
    Add 15 oz washing soda to bring pH up to 7.5
    Add 176oz baking soda to bring TA to 100
    Add 289 oz calcium chloride to raise CH to 260

    Do I put all these things in at once?
    Figures sound on target?
    15 K gallons
    Gunnite
    Centurion Pump/Hayward Sand Filter
    Polaris 360 Robot

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    Mod Squad jblizzle's Avatar
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    Re: Calcium hardness

    The baking soda will have some affect on the pH ... and the washing soda will have some affect on the TA.

    I would suggest raising the CH to 300, TA to about 80ppm and pH to 7.5

    The CH can be done any time, but I think you are best to adjust the pH before the TA ... note that the changing 1 affects the estimates of what you have to add to change the other.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
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    Re: Calcium hardness

    What do you think is the most cost effective place to purchase the calcium?
    15 K gallons
    Gunnite
    Centurion Pump/Hayward Sand Filter
    Polaris 360 Robot

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    Richard320's Avatar
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    Re: Calcium hardness

    Numbers don't look quite right. I think it went to the default 10,000 gallons, not your 15000. I'd work things one at a time, as Jason said. pH first. Do it when you have time to brush the pool to mix things. And probably give things an hour to mix, if not more, before retesting and adding the next.
    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!

  7. Back To Top    #7
    Mod Squad jblizzle's Avatar
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    Re: Calcium hardness

    I think you had the #s correct ... I have 15k gallons set and see the same quantities.
    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
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    Re: Calcium hardness

    Redid the numbers....you were right....the amount of calcium needs to be much more.....
    Just added some ash to bump the ph a bit
    Any suggestions on where to get the calcium? The evil pool store?
    15 K gallons
    Gunnite
    Centurion Pump/Hayward Sand Filter
    Polaris 360 Robot

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    Re: Calcium hardness

    Thanks for checking on me jblizzle...
    15 K gallons
    Gunnite
    Centurion Pump/Hayward Sand Filter
    Polaris 360 Robot

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