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Thread: High CSI

  1. Back To Top    #1

    Join Date
    May 2010
    Denton, TX

    High CSI

    I am new to this, so I'm not real sure what I'm doing...

    Here are my test results from this evening:
    FC: 4
    pH: >8
    TA: 175
    CH: 200
    CYA: 30

    After entering my results into the pool calculator, it shows that my CSI is 0.82. Way higher than the 0.6 max...

    I have been working on getting my TA down to a normal level for the last couple of weeks. I'm not sure, but I believe that once my TA is down, my pH will keep from shooting up above 8 over night.

    Any suggestions?
    16K gal, IG plaster, DE filter, 2.5 HP Pentair Challenger

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: High CSI

    Welcome to TFP!

    Yes, lower TA will help prevent the PH from shooting up so quickly. Try lowering the PH to 7.0 in the evening, if you aren't doing that already. That might be enough to get through the night. Letting the PH get that high with TA high risks calcium scaling.
    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

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