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Thread: CSI question

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    CSI question

    I am confused about the CFI numbers on the pool calculator.

    My pool: 20,000 gal. Intellichlor Salt Generator Plaster surface (new plaster 3 weeks old)
    FC 5
    pH 7.5
    TA 120
    CH 340
    CYA 70
    Salt 3400

    The CSI number on the left is -0.28 and reads "balanced"
    The CSI number on the right is -0.32 and reads "potential for corrosion"

    Why is there two numbers?
    Thanks
    14,500 gal pool
    Inground
    Plaster
    Intellichlor Salt Generator
    Water Fall

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    linen's Avatar
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    Jul 2010
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    Re: CSI question

    The number on the left is a calculation that corresponds to the now column (left most) measurements you put in for the test parameters (pH, TA, CH, CYA, Temp, Salt level, Borate level). The number on the right is a calculation that corresponds to the Target column (right most) of where you are adjusting those parameters to.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    JasonLion's Avatar
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    Silver Spring, MD
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    Re: CSI question

    There are two columns, "Now" and "Goal". The number on the left shows the CSI for the "Now" column, while the number on the right shows the CSI for the values in the Goal column.

    With plaster only three weeks old, you shouldn't be worrying about CSI just yet. The TA and CH levels will continue going up as the plaster cures. If you adjust them now they will probably end up being too high in a couple of weeks.
    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

  4. Back To Top    #4

    Re: CSI question

    Quote Originally Posted by linen
    The number on the left is a calculation that corresponds to the now column (left most) measurements you put in for the test parameters (pH, TA, CH, CYA, Temp, Salt level, Borate level). The number on the right is a calculation that corresponds to the Target column (right most) of where you are adjusting those parameters to.
    If I adjust to the number on the right then the reading "potential to become corrosive". How do I know what number to adjust to?
    Thanks for the response.
    14,500 gal pool
    Inground
    Plaster
    Intellichlor Salt Generator
    Water Fall

  5. Back To Top    #5

    Re: CSI question

    Quote Originally Posted by JasonLion
    There are two columns, "Now" and "Goal". The number on the left shows the CSI for the "Now" column, while the number on the right shows the CSI for the values in the Goal column.

    With plaster only three weeks old, you shouldn't be worrying about CSI just yet. The TA and CH levels will continue going up as the plaster cures. If you adjust them now they will probably end up being too high in a couple of weeks.
    At what point should I start adjusting for CSI? How old should the plaster be?

    Thanks Jason
    14,500 gal pool
    Inground
    Plaster
    Intellichlor Salt Generator
    Water Fall

  6. Back To Top    #6
    linen's Avatar
    Join Date
    Jul 2010
    Location
    Twin Cities, MN
    Posts
    8,649

    Re: CSI question

    Quote Originally Posted by Miscanthus
    At what point should I start adjusting for CSI? How old should the plaster be?
    I will let others chime in on this. Here is the pool school article: http://www.troublefreepool.com/pool-...aster_start-up
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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