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Thread: Balancing Cold Water

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    Balancing Cold Water

    I have a 2 month old pool, completed in October. I live in the South East and will keep the pool open (technically), as my spa is located inside the pool. I'm trying to balance water that has a temperature of about 48 degrees and am having trouble keeping the LSI under -.50. At ideal PH (7.5), Akl (100), and Hardness (180) the LSI is -.60.

    Which of the three attributes should I try and raise, if any? PH? Akl? Hardness?

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    Mod Squad zea3's Avatar
    Join Date
    Jul 2009
    Houston, Texas

    Re: Balancing Cold Water

    Hi, welcome to TFP! If your pool has a plaster finish then your calcium level needs to be 250 ppm. If you have a vinyl or fiberglass pool 180 would be fine. What are you using to test the water?
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    Re: Balancing Cold Water

    It's plaster, but even at 250 the LSI is -.25. How would one go about about getting it lower than that at a water temp of 48 degrees?

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    dmanb2b's Avatar
    Join Date
    Apr 2009

    Re: Balancing Cold Water

    Welcome to TFP. You can play around with the values on I would think CSI of -.25 is just fine.
    24'x52" AGP (13,500 Gallons), Intex SWG, (2)Solar Bear 4x20 panels, Hayward S220T Filter, 1/2hp Pentair Superflo

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    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: Balancing Cold Water

    Unless you have metals in the water, you can have the pH be higher, say around 7.8. Colder water will naturally have a higher pH, all else equal. Usually you have the CH for a plaster pool be around 300 ppm or so.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
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