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Thread: Don't understand CSI numbers

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    kywildcats's Avatar
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    Don't understand CSI numbers

    I really don't understand CSI numbers. Here is what I have now
    FC 6
    PH 7.6
    TA 70
    CH 75
    CYA 70
    Salt 3000
    Water temp 81
    According to my calculations my CSI is. -0.93
    Is this even close going by my signature? What advise?
    Mark
    20'x28' IG, Vinyl, (Sept 2015) 14,900 Gallon, 3'4 to 5'6 deep, SPLAPOOL 1.5 HP, 220v, 2 speed pump, Waterway Carefree 27" 400 LB Sand filter, Digital Nano plus SWG, TF-100 test kit /speed stir. Dolphin Primal x3 robotic cleaner

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    Mod Squad pooldv's Avatar
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    Re: Don't understand CSI numbers

    In a vinyl pool being overly negative on CSI is not a problem because you don't need to worry about etching the plaster. Just keep avoid letting it go over +0.3 to avoid scaling.
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    BoDarville's Avatar
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    Re: Don't understand CSI numbers

    CSI (in particular low CSI) is more of a concern for plaster pools. Your parameters are within range, so I wouldn't fret about the low CSI number since you have a vinyl pool.

    Plaster pools require more CH in order to guard against water with low calcium levels from dissolving calcium out of plaster, but this is not a concern in a vinyl pool. Continue focusing on keeping your parameters in range and enjoy your pool.
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    kywildcats's Avatar
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    Re: Don't understand CSI numbers

    Thank you guys!!!
    Mark
    20'x28' IG, Vinyl, (Sept 2015) 14,900 Gallon, 3'4 to 5'6 deep, SPLAPOOL 1.5 HP, 220v, 2 speed pump, Waterway Carefree 27" 400 LB Sand filter, Digital Nano plus SWG, TF-100 test kit /speed stir. Dolphin Primal x3 robotic cleaner

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