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Thread: a question regarding CSI

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    tedinelkgrove's Avatar
    Join Date
    Jul 2009
    Location
    Elk Grove, CA
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    98

    a question regarding CSI

    I reduced my TA down to ~50ppm to compensate for a drifting pH. The only issue I have is my CSI seems extremely off now, appr. -0.30 to -0.40 depending on pH and water temp. Here are my number right now:

    FC = 7
    pH = 7.8
    TA = 50
    CH = 280
    CYA = 40
    Borates = 50
    CSI = -0.26
    Temp 75F

    If my pH drifts to 8.0, which it still does but now it takes longer, then if I lower pH to 7.6, CSI is -0.39. Those values should soon be offset a little (0.05 to 1.0 for 80 and 85F water, respectively) when the temp rises today and tomorrow now that the rain and cold have moved out of Northern Cal

    Are these CSI values harmful to the pool? I do have some scaling on the tiles, but that was there last June 1 when we bought the home. The chemistry was probably out of wack for sometime, and it was a foreclosure. They were using hockey pucks when I bought it, and I quickly switched to BBB. Only issue has been pH drift.
    ~15000 gallon inground, plaster pool
    Jandy CL460 Cartridge Filter Tank, Jandy Stealth SHPF 1.5hp pump, Pentair Legend II cleaner
    Leslie's DPD Complete Test Kit, TF Tests FAS-DPD Chlorine Test Kit
    Heliocol solar pool heating (HC-40 x6)

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    JasonLion's Avatar
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    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: a question regarding CSI

    You will be fine. If it bothers you, you can raise the PH level by 0.1 or 0.2 till the water warms up.
    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

  3. Back To Top    #3
    tedinelkgrove's Avatar
    Join Date
    Jul 2009
    Location
    Elk Grove, CA
    Posts
    98

    Re: a question regarding CSI

    Thanks Jason.
    ~15000 gallon inground, plaster pool
    Jandy CL460 Cartridge Filter Tank, Jandy Stealth SHPF 1.5hp pump, Pentair Legend II cleaner
    Leslie's DPD Complete Test Kit, TF Tests FAS-DPD Chlorine Test Kit
    Heliocol solar pool heating (HC-40 x6)

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