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Thread: Total hardness in spa (What is that)

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    Join Date
    Oct 2016
    Bandera texas

    Total hardness in spa (What is that)

    I used a test strip in my spa, what is the total hardness on strip.

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    Isaac-1's Avatar
    Join Date
    May 2010
    SW Louisiana

    Re: Total hardness in spa (What is that)

    Total hardness is the combination of calcium hardness and magnesium hardness, we really only care about Calcium hardness most of the time. This is part of the problem with using test strips vs a quality drop based test kit (many of the cheaper drop based test kits also only test for total hardness). The fact that we tend to call them guess strips is the other big problem with them.
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