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Thread: CSI?

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    Happy New Year!! Thanks to this board I've got a good understanding of the chemistry now, but the CSI thing on the calculator has me confused. It seems most recommendations for CH are 250-350, my 2 mo old plaster is at 280. When I plug my readings in, it says I need to raise my CH to 450 to get the rec. CSI of -0.6......that seems to be high from I've read, what do you think?


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    Richard320's Avatar
    Join Date
    Jan 2010
    San Dimas, CA (LA County)

    Re: CSI?

    Check for a typo when you entered the data. I get CSI -.45 with your numbers, which is fine.
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    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: CSI?

    Your pH should be rising with the relatively new plaster curing. You can target a pH of 7.7-7.8 given the colder water temps. Normally water will rise in pH as it gets colder anyway and this tends to keep the CSI fairly constant.
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