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Thread: Calcium levels

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    Calcium levels

    I have a SWG plaster pool. All numbers are good. Calcium is at 290. Should I keep that around 350 to 400 to prevent plaster damage?

    Thanks
    14000 gallon SWG gunite/quartz plaster,450 swimclear cartridge filters, 2hp pump.

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    borjis's Avatar
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    Re: Calcium levels

    yes.
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
    (1.5 HP motor) Raypak PR266AEN (266k btu) gas heater. TF-100 Test Kit.
    Dolphin E10 Cleaning Robot.

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    JoyfulNoise's Avatar
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    Re: Calcium levels

    Please post a full set of test results. We can not advise you based on one number.

    There is no such thing as a magic CH number. Scaling of calcium or etching of plaster results from a combination of factors. You can only be properly advised if you post all of your test results.


    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Re: Calcium levels

    FC - 3
    CC - 0
    PH - 7.2
    TA - 80
    CH - 290
    CYA - 60
    Salt - 3000

    Using the Taylor 2006 kit. Water is clear and 62 degrees
    14000 gallon SWG gunite/quartz plaster,450 swimclear cartridge filters, 2hp pump.

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    JoyfulNoise's Avatar
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    Re: Calcium levels

    Quote Originally Posted by mehyler View Post
    FC - 3
    CC - 0
    PH - 7.2
    TA - 80
    CH - 290
    CYA - 60
    Salt - 3000

    Using the Taylor 2006 kit. Water is clear and 62 degrees
    So, with your current numbers your CSI is -0.78 which means your water is corrosive to plaster. If you immediately raise your pH to 7.8 with borax, your CSI will be -0.22 which is perfectly fine for a plaster pool. So I have a couple of follow on questions -

    1. Why is your pH so low?? there is no reason to keep cold pool water that low.

    2. Do you struggle with keeping CH up during a normal pool season? I ask because if you get a lot of rain dilution, then I would go ahead and add some extra CH. Where I'm from (the dry desert), we almost never have to add any CH, we get plenty of it from out fill water and evaporation. So I am very leery to tell anyone to add CH when there are easier ways to adjust the CSI (like letting the pH go up).
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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