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Thread: Advice on CSI

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    TheBraLady's Avatar
    Join Date
    Jun 2015
    Concord, NC

    Advice on CSI

    I would like to dial in my water chemistry to get my CSI to be "balanced." I *think* I understand that it doesn't really "matter" since I don't have a plaster pool, but I recently read in a thread about the CSI also affecting the life of the salt cell.

    So here are my test results as of this morning:

    FC 5.5
    CC 0
    pH 7.6
    TA 70
    CH 150
    CYA 50
    Water Temp 74
    Salt (per the control box) 2800
    Borates 50

    My pump runs for 8 hours each day on low and then 4 hours on high. My SWG is set to 15%.

    The pool is in full sun basically all day.

    So Pool Math calculates my CSI at -0.68. If I bump FC to 6, pH up to 7.8, TA up to 80 and CH up to 300 my CSI would be -0.14.

    My hesitation is that this pool is SO EASY to care for. I seldom ever have to adjust the pH. It is super happy at TA 70 and pH 7.6. Am I asking for trouble?


    And thank you in advance!
    Pool Completed 8/2015 18'x36' Gemini shape 3.5' - 8', 19,200 gal IG vinyl, Hayward Max-Flo 1.5 HP 2-speed pump, Hayward Pro Series 300-lb sand filter, Hayward AquaPlus SWG, NO Autofill, Dolphin M400 robot, Taylor 2005 test kit, 434 gal Bullfrog A7L spa

  2. Back To Top    #2
    Mod Squad woodyp's Avatar
    Join Date
    Apr 2010
    East Texas

    Re: Advice on CSI

    You're fine just where you are.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
    Margaritaville Frozen Concoction Maker, Liqour Chiller, & Drink Mixer & Party Tub----Collect 'um all!

  3. Back To Top    #3

    In the Industry

    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: Advice on CSI

    If it ain't broke........
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  4. Back To Top    #4
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    DFW, TX

    Re: Advice on CSI

    Yep, I agree. I would say that any CSI between -0.6 and 0 is perfect for a vinyl pool. So, you are very close. I would let pH rise to 7.8 if it wants to and leave it alone.
    TFP Moderator
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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