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Thread: Low Calcium Hardness and high Total Alkalinity

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    Low Calcium Hardness and high Total Alkalinity

    Hi Guys:

    This continues a previous post about pool shock and your advice to get a real test kit. I got the TF-100 and had a lot of fun with it over the weekend.

    Here are my numbers:
    FC: 5
    CC: 0
    TC: 5
    pH 7.5
    TA: 180
    CH: 40
    CYA: 40

    So here are my questions:

    Should I do anything about the high TA? I read somewhere on the boards that you should not, unless there is a specific problem, but I'd still appreciate some guidance.

    Since my pool is vinyl-lined, and I am used to soft water showers, should I bother raising the CH?

    Thanks.
    Jake

    24' Round Vinyl-lined AG, 14K Gal., Hayward Xstream 1500 Cartridge filter w/ powerflow Matrix pump, Hayward H200 Heater, plus one ribbit

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    saraiks's Avatar
    Join Date
    Jul 2007
    Location
    Fremont, CA
    Posts
    74

    Re: Low Calcium Hardness and high Total Alkalinity

    How is your pH reading varying over time ? do you have to add a lot of acid ?
    16,000 G in ground Gunnite (plastered) with attached Spa, Gemini 3 NG Heater, Sta-rite cartridge filter, Aquabot Mark V, TF test kit

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    Re: Low Calcium Hardness and high Total Alkalinity

    I have never needed to lower pH, but I have had to raise it a bit. It got as low as 7.1 or 7.2. The reason my TA went so high is that I was using Baking Soda to raise pH.
    Jake

    24' Round Vinyl-lined AG, 14K Gal., Hayward Xstream 1500 Cartridge filter w/ powerflow Matrix pump, Hayward H200 Heater, plus one ribbit

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: Low Calcium Hardness and high Total Alkalinity

    It sounds like things are fine the way they are, so I would leave it alone.
    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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    Re: Low Calcium Hardness and high Total Alkalinity

    Thank you!
    Jake

    24' Round Vinyl-lined AG, 14K Gal., Hayward Xstream 1500 Cartridge filter w/ powerflow Matrix pump, Hayward H200 Heater, plus one ribbit

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