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Thread: Hardness Question

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    Hardness Question

    Hypothetical question.

    If I have a pool that according to the Saturation Index is at 0.0 for perfectly balanced, but the calcium hardness of the pool is 800ppm, is there still a possibility for scaling since it's above the recommended 400ppm? Also, at what ppm of calcium will water not be able to dissolve anymore calcium?

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    Patrick_B's Avatar
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    Re: Hardness Question

    Welcome to TFP!

    Yes, depending on what else happens in the pool sure it's possible, and with less than 800. Scaling is dependant on more than one factor. Not assuming you don't realize that, but it needs to be said. I don't know the answer to your second question, but whatever that value is, it's impractical to apply it to any likely pool scenario. Maybe you're just a curious sort like me, so I'm curious why you ask that.
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    Re: Hardness Question

    I work around pools that have higher calcium levels but still fall into acceptable ranges on the saturation index and wanted to see if it was safe as long as they fall into acceptable ranges on the saturation index?

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    Richard320's Avatar
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    Re: Hardness Question

    I deal with this constantly with my pool. You can still get scaling in areas with poor water circulation. It's not too hard to keep the CSI neutral up to about 800 CH, but as the water gets warmer, your ability to tweak pH and TA to keep it there gets smaller and smaller. And of course, CH is going to keep creeping up. It's time to start replacing some water.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
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    Re: Hardness Question

    So the pvc pipes shouldn't get clogged with scale since it is balanced according to saturation index?

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    Richard320's Avatar
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    Re: Hardness Question

    Quote Originally Posted by Brettdawson View Post
    So the pvc pipes shouldn't get clogged with scale since it is balanced according to saturation index?
    I imagine the walls would be covered with grow-your own sandpaper long before the plumbing closed up.
    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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